Just to clarify, none of the drugs containe codiene or would trigger a test for codiene or
morphine.
Xanax and
valium are sedatives in the benzodiazapine class, they are chemaclly unrelated to opiates are have different applications. a test for benzodiazapines would reveal valium or xanax use.
Tylox contains oxycodne as it's narcotic ingredient (mixed w/
Tylenol).
Oxycodone is a narcotic but is not metabolised into codiene or morphine (which are the two chemicals tested for in standard opiate urine tests). oxycodone is certainly possible to test for w/ a hair test, but would require a specific test rather than a generic "opiate screen" to detect it. More info on drug screening at
http://www.erowid.org/psychoactives/.../testing.shtml
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