No. Xanax is a benzodiazepine; benzos are central nervous system depressants.
CNS depressants are not drugs of concern to DOT because no truck driver wants a drug that will make him sleepy; if a trucker is going to do illegal drugs he wants the kind that will keep him up all night so he can drive farther.
Valium and xanax are benzodiazepines and are not tested for on a DOT drug screen at all. In fact, it is illegal to test for these substances on a federal DOT test. The DOT drug screen looks for marijuana, opiates, PCP, amphetamines and cocaine. There's no such thing as a drug it's illegal to test for according to the DOT; they could test you for steroids if they wanted to. The reason they only test fpr those five drugs is that they're the five drugs most likely to be found in a trucker's urine. Considering that most drivers who do drugs are doing so to stay awake, why would any trucker do downers?
Valium and other benzodiazapines are easily detected in urine.
no, they don't test for benzos
Don't take Valium!
No.
Yes it will, as Valium has a long 'half life'.
no
Valium will show as a Benzodiazepine. Unless they are specifically tested for, most standard tests don't test for this family of drugs though.
no
benzodiazepine (i.e. Lithium, Valium, etc.)
Half life of Valium is 20 -100 hours, depending on amount taken.
Any benzodiazepine will.