Allopatric speciation is just a fancy name for speciation by geographic isolation, discussed earlier. In this mode of speciation, something extrinsic to the organisms prevents two or more groups from mating with each other regularly, eventually causing that lineage to speciate.
The downside of this is that it can only tell if youâve engaged in drug use in that window. For example, if you smoke marijuana on a daily basis but stop 2-3 days prior to your mouth swab test, the results will probably come back negative. It canât detect prolonged use or the remaining presence of a trace amounts like a urine test can.
Saliva Drug Test. Saliva testing is the newest method to detect the presence of marijuana. This technology will detect the delta-9-tetrahydrocannabinol found in marijuana or Parent THC. This test is more appropriate for recent marijuana usage which could be for just a few hours up to 3 day.ow long Marijuana will show in a drug test. Marijuana is a oil based drug which will make it more detectable since is not water soluble and will allocate in the fat cells of the body. It is hard to tell how long marijuana will manifest in a drug testing because the time to detect its presence depends on many factors.