I can provide all the information about drug testing processes of any Specimen type. The lab I work at specialized in drug testing. I also have tons of training and inside information from people that do the direct testing on the specimens. I know about how drugs will remain in different types of people and how long they stay. I don't know of the effects of the drugs but I know about testing for them.
I have done tests for both of those and I have seen where people straight pass tests after smoking which just blows my mind. Marinol is tricky. I've had two people have issued during testing involving marinol. But thc will metabolize into 2 different things. The first is carboxy: Marijuana that has sat in the body for a time. The other is Marijuana that was recently Ingested. The labs can test for both to either indicate recent use or past use. But for standard urine testing they look for any use. Unless it's child protective services or court systems. They sometimes look for decreasing levels of the marijuana showing less use or no use since the last test. And the best way to pass is to use clean urine. Fake urine will be detected in the lab usually. But urine must be between 90 and 100 degrees and it must be at least 30mL of specimen. Also synthetic drugs are not included in a standard test. These are special tests that will only look for synthetics.one last thing is if you have a prescription for a drug and they are testing for that. You are covered by the prescription. They can't mark it as positive because it's a legal prescription so don't worry.
I don't believe that most labs would unless it's a newborn baby's first poop. Usually those are for testing mothers use when pregnant. But other than that I have never done any and we use most testing methods.
Alot of the synthetic urine specimens have a neon yellow color, no scent, and have no foam from peeing pressure. Also the lab can run a test called a "specific gravity" test that proves whether if it's synthetic or real. They usually only run this if the collector has suspicion. But sometimes synthetic urine does make it through the lab with no problem. Synthetic urine most always works with Instant tests though.
