I have failed 5 consecutive drug tests for benzodiazepines at the clinic I attend. I have been getting these drug screens for nearly a year now and I normally fail for amphetamines and methadone (its a methadone clinic.) I have been taking dextroamphetamine, alltace, and minocycline since I started attending the clinic over 10 months ago. The only new medicine I've started taking in the last couple months was the concerta 36mg. The nurse at the clinic says that concerta wouldn't cause me to fail for benzos, which makes sense. I know what benzodiazepines are and definitely have not been taking any since the drug screens starting testing positive over a month ago. I really need to figure out why I keep failing them though. Anyone know what could be causing it?
3 Jul 2010
I found this interesting article about drug screens. Although it may not apply to you, ask your clinic to use a new batch of test kits as they have a limited shelf life. Obviously your clinic believes something odd is going on otherwise they would have terminated your contract after failing 5 times. I'll try to find some additional information regarding your problem.
"According to R. Brookler, "Industry Standards in Workplace Drug Testing," Personnel Journal, (April 1992). Laboratories admit that urine tests are not always accurate. The manufacturers of all drug testing equipment acknowledge that all positive results should be confirmed with a more sophisticated test. The only acceptable drug confirmation test is the costly gas chromatography/mass spectrometer. Without confirmation by an alternative testing method, urine drug tests are not sufficiently reliable to hold up in court.
"Only 85 of the estimated 1,200 laboratories in the United States currently testing urine for drugs meet federal standards for accuracy, qualified lab personnel, and proper documentation and record-keeping procedures. Because private companies are not required to use certified drug testing labs, workers are being asked to put their job security in the hands of a drug test that has insufficient quality controls."
Even in labs that do meet the minimum standards, there is plenty of room for error. Your urine sample will change hands many times before its actual drug analysis, which increases the risk of mix-ups and errors. Also, the chemical reagents used in drug testing have a limited shelf life, which can cause "false positives". (A false positive is a sample showing a positive for drug metabolites when there are no metabolites in the person's system.)
Most states do not regulate the operations of urine drug test labs; in fact, some labs have fewer quality control regulations than restaurants. Your typical private employer may use any lab she/he chooses, which would most likely be the least expensive. Findings from the Center for Disease Control in Atlanta stated: "... the labs somehow detected cocaine in as many as 6 percent, and amphetamines in up to 37 percent of urine specimens that were 'blank" (those containing no drugs at all)."
Good luck to you and hope you find the answers soon.
My best wishes,
- Concerta Information for Consumers
- Concerta Information for Healthcare Professionals (includes dosage details)
- Side Effects of Concerta (detailed)
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