How doxycycline may affect a urine drug test?

Hi JD1977. You have every right to be concerned about false positives. Each day, many people will lose a job, child custody, and a good reputation because of faulty testing. Below is an excerpt from a book that covers Drug testing in the U.S. I hope you aren't one of their statistics. Best wishes,
chris

False positives are caused by:

*Nasal decongestants such as Dristan, Neosynephren, Vicks Nasal Spray, and Sudafed, which cause false positives for amphetamines.

*Poppy seeds like those on a dinner roll, which cause false positives for opiates. Even the highest-quality test currently available, the GCMS test, still confuses poppy seeds with heroin.

*Pain relievers such as Advil, Nuprin, Midol, Trendar, or any medicine containing ibuprofen cause false positives for marijuana.

*Antibiotics such as amoxicillin or ampicillin cause false positives for cocaine.

The above list is only a beginning. Most substances which people have in their blood have never been tested to see if they cause false positives. Indeed, even some natural body enzymes cause false positives. According to research validated by the Congressional Office of Technology Assessment, melanin, the natural pigment which makes skin dark, can cause false positives for marijuana.