referring to the drawings , some of the reference numerals are used to designate the same or corresponding parts through several of the embodiments and figures shown and described . variations of corresponding parts in form or function that are depicted in the figures are described . it will be understood that variations in the embodiments can generally be interchanged without deviating from the invention . urine samples are collected as part of the normal processing for a wide variety of people for a wide variety of reasons . urine specimen collection for drug analysis is rife with donors who try to cheat the system . some donors come to the testing facility with urine collected earlier or urine from third parties . some donors will even attempt to conceal these samples in body cavities to simulate that the sample is at body temperature . technicians that complete chain of custody documents must be vigilant to prevent attempts to cheat . there are a many warning signs of cheating . for instance , if the technician observes that the urine sample collected is significantly less than the normal human body temperature , for example at around room temperature , this is an indication that the sample provided is not a fresh sample . another indication is the behavior of the donor : if shortly prior to the donor &# 39 ; s delivery of the urine sample , the donor is seen to be acting in a peculiar manner ( i . e . they are seen fiddling in and around their pants or armpits or the donor is insistent in urinating with their back to the person observing their activity ) this is probably an indicator that they are planning on attempting to cheat . to combat these cheating methods , systems of prevention have been patented in the past . for instance a method to ingest a tagging substance was developed in u . s . pat . no . 5 , 039 , 616 . also apparatuses designed to restrictively engage a donor &# 39 ; s hands making it impossible to insert a false specimen into a container during a urine test were disclosed in u . s . pat . no . 6 , 620 , 384 and u . s . pat . no . 6 , 331 , 278 . these inventions are expensive , not fully reliable , and cause an undue burden on the donor when delivering a urine sample . moreover , donors may object to ingesting a tagging substance that contains elements unknown to them into their body . the apparatus and methods disclosed herein for collecting urine specimens attempt to limit the opportunities for cheating as much as possible . prior to collecting a sample , the technician installs a barrier 10 in a standard toilet 14 as shown in fig1 . the barrier 10 is sized to sit in the toilet 14 above the water level of the toilet 14 . generally a barrier 10 that is six inches by ten inches is of sufficient size to suit this purpose . the barrier 10 could be a grill as shown in fig1 or it could be a mesh or other surface that can serve the purpose described herein . the barrier 10 could be a flat surface without openings . nevertheless the presence of openings allows for any spills and excess urine ( after completion of the collection procedure ) to pass through the barrier 10 with minimal cleaning required . the barrier 10 could be made of metal , plastic , wood or any other suitably durable material that is easily cleaned . ideally the material should be reusable so that the barrier 10 can last longer than a year ; ultimately making the procedure more cost effective . as can be seen in fig1 through 2b , the toilet seat 16 is covered with a clean collection unit 12 which is usually a disposable plastic bag that is large enough to cover the seat entirely and have enough surface area such that the technician can form a depressed pocket 17 into the toilet seat 16 . preferably , a clear seven to fourteen gallon polyethylene bag has been found to be an acceptable collection unit 12 ; larger bags may also be used but have been found to be unwieldy and more difficult to handle . polyethylene bags are easily disposable , cost effective , and sanitary . the bags also serve as a sanitary liner for the toilet seat 16 for women donors while sitting . however , care should be taken to ensure that whatever collection unit 12 is used should come from reputable sources and that the collection unit 12 is not manufactured of or coated with any material which could adversely affect the testing of the collected urine sample . moreover , the collection unit 12 eliminates the need to hand a specimen cup to the donor which further reduces the risk of tampering with the procedure ( e . g . the puncturing of devices within the vaginal cavity by women donors when they are handed a specimen cup , or disguising the flow of false urine as natural by using the specimen cup to visually block the source of the flow , or by the donor adding contaminants or other chemicals that will interfere with the laboratory analysis of the collected urine specimen ). the barrier 10 prevents the collection unit 12 from coming into contact with the water in the toilet 14 so that urine collected in the collection unit 12 is not unduly cooled before it can be collected and allows excess urine to drain into the toilet upon completion . moreover , the barrier 10 prevents a donor from access to the water in the toilet 14 so they are unable to dilute the specimen with water from the toilet 14 . blocking donors from water in the toilet 14 alleviates the need for dying the water , as required in some prior art procedures , so as to indicate whether any tampering occurred ; ultimately reducing the cost of the drug test . the donor urinates into the depressed pocket 17 formed in the collection unit 12 . soon thereafter , the technician obtains a urine sample directly from the depressed pocket 17 in the collection unit 12 using a clean specimen cup , seals the cup , and disposes the collection unit . the actual collection chain of custody process involves the technician performing a number of predefined steps to ensure consistent sample collection that becomes routine and as unassailable as possible . fig3 lists these predefined steps that are taken in the novel method . first the donor presents photo identification 18 , for the purpose of preventing identity fraud , and any insurance identification required . once donors are brought into the urine collection area 20 , they are not permitted to leave until after the required specimens are obtained otherwise the procedure is voided . donors are instructed to empty their pockets 22 of all contents on a designated counter . purses , coats , scarves , jackets , gloves , etc . are also to be placed on the designated counter . any items not permanently affixed to the donor &# 39 ; s hands 24 such as any jewelry including rings , bracelets , and watches , must be removed and placed on the designated counter . all rings that cannot be removed must be closely examined by the technician and then covered with tape or a glove to prevent their being used to puncture any urine filled bags designed to provide a fake sample . adhesive bandages or other bandages must be removed from all areas of the donor &# 39 ; s hands , fingers , and wrists prior to urine collection to prevent the possibility that such bandages may hide contaminants such as bleach or powdered drugs or sharp objects ( again for puncturing urine filled bags or the like ). if bandages cannot be removed due to active bleeding , the technician will provide the donor with an unused glove to cover the affected area . the donor &# 39 ; s axillary regions will be checked 26 for foreign objects by the technician . donors are instructed to wash their hands 28 thoroughly ( so as to remove any contaminants ) prior to submitting urine samples . the donor will witness 30 the technician obtaining and installing a new unused collection unit 12 on the toilet seat for the donor . it is encouraged that the technician wears medical gloves while installing the collection unit to reduce the risk of cross contamination of the collected urine sample and also to increase the integrity of the collection process . the donor will be observed closely 32 at all times by the technician until the urine specimen has been collected . the technician directs the donor to urinate 34 into the collection unit 12 . female donors are instructed to refrain from having hands near the donor &# 39 ; s vaginal area until the sample collection process is complete . keeping their hands away from the vaginal area prevents them from puncturing devices that could be located within the vaginal cavity . female donors will be directed sit on the lined toilet seat 16 with both hands visibly raised and fingers spread until urine delivery is completed . the female donor is directed to urinate into the depressed pocket 17 formed in the collection unit 12 . female donors will be instructed not to have hands near their vaginal areas until they stand a step forward from the toilet 14 . the female donor will only be permitted to wipe themselves after they step away from the toilet 14 and will be instructed to dispose the used toilet paper into a designated trash receptacle and not into the toilet 14 . at all times , the technician observes the donor for irregularities in the collection process . male donors will be directed to stand in front of the standard toilet and positioned so that the donor stands facing sideways to the technician and so that no portion of the donor &# 39 ; s back is facing the technician . male donors will be directed to place one hand behind their back , or raised above the head in plain view , and the other hand to guide urine flow onto the depressed pocket 17 in the collection unit 12 located within the toilet 14 . at all times , the technician observes the donor for irregularities in the collection process . it is important the technician is careful to properly make sure that the flow of urine is a completely natural one and nothing suspicious is occurring during the collection process . the technician will collect the urine sample 36 in a clean unused collection cup directly from the collection unit 12 . the technician will test the temperature of the urine sample to determine the warmth of the urine with either a thermometer or a temperature strip , either from the sample cup or from within the collection unit 12 . the technician then seals the collection cup . the donor will sign a log 38 verifying that they observed that a new collection unit 12 was used and installed on the toilet seat 16 , that their urine was collected in a new specimen cup that was sealed and that their collection unit 12 was disposed . the technician completes the chain of custody documentation 40 and processes the urine sample for analysis . if the donor is noncompliant with any of the above steps , the urine sample will be considered void and a repeat attempt to with the proper technique must follow , or the appropriate agency will be notified of the donor &# 39 ; s inability to submit a urine sample with the collection guidelines . this invention has been described with reference to several preferred embodiments . many modifications and alterations will occur to others upon reading and understanding the preceding specification . it is intended that the invention be construed as including all such alterations and modifications in so far as they come within the scope of the appended claims or the equivalents of these claims .