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.
Most of marijuana's active components are lipophilic (that means that they are fat soluble), and this has a consequence: a long elimination time, compared to hydrophilic (water soluble) compounds. THC is usually detectable in drug tests from 3 to 10 days.Some heavy users could (exceptionally, and using low cutoff levels) produce positive tests for up to a few months after ceasing cannabis use, as this period varies greatly according to metabolism, quantity, frequency of use and degree of sensibility tested.annabis will stay in your system for at least a month from the last sitting of ingesting/smoking the substance. My opinion would be to wait that long (4-5 weeks) before taking a medical test. In saying that, many medical tests search for different things, depending on why you're having the test.