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Read more about prescription drugs and drug tests.

Whenever you take any illegal substance (drug), body starts acting on it. Body converts drug remnants into drug metabolites. In all drug testing this drug metabolic level is taken into account. There are so many substances which show same resemblance with chemical structure of drug metabolites. If laboratory is not authorized one, then there is huge chance of getting false positive result. Even home drug test shows false positive result sometimes. Fact is that in screening mode of testing fail to distinguish between two. For example is used for treating alcohol withdrawal and muscle Spasms. But diazepam is one of the drug metabolites for marijuana. Hence when you know you are having drug test in coming days, then do not take medicines over the counter. Same is applicable for food and dietary supplements. Most dietary supplements have cocaine which acts as an appetite suppresser. So it is always advisable to have medicines or food supplement prescribed by medical authority.

One more myth about of drug detection is does second hand smoke fail drug test? Well answer of the above question is “no”. You can’t test positive, if you are second hand smoker. There are set threshold levels for each and every drug metabolites. With second hand smoke, body is not able to process that much drug metabolites to get positive result. You will not get false positive result as well, even if you are in small room. However, with saliva testing you may get positive result this sort of testing is taken as random testing. If you have doubt about result, then you can have detox shampoos to clean drug traces from scalp if any. Drugs like meperidine or codeine have same structure as that of morphine. Out of these two, codeine is most common drug on pains and cough medicines. If you take it for longer period of time, it causes addiction as well.

If you observe, there are literally thousand brands and general medicines prescribed today. If you have even slightest doubt on particular prescribed drug, immediately get to know about it, whether it can show positive result for any drug like methamphetamine or benzodiazepines etc. Confirm with your pharmacist about drug classification. One way to avoid risk of false positive result ask technician for advance drug testing methods like GC MS. They decrease the percentage of getting faulty result.