druganonymous

Wow. Well, some clients do not order the validity tests, they only look for the drugs. This is to reduce costs I assume, because they cannot charge you the cost of the drug test. I do on occasion catch synthetic urine (I can recognize it because we use it too to make up our negative controls) when it fails the validity tests.

Maybe a month.

For. But as it is currently illegal, I have no qualms about continuing to test for it.

This happens. I have to go into the store room and pour more out of the donor's bottle into a new tube. If we run out of urine...well... =/ Clients really don't like that.

Probably THC for a chronic user. It continues to leech out of the fat and into the urine for weeks. A first-time user might be clean after 2-3 days, but someone who uses every day will be positive for a long time.