safety tells me if your planning to have a couple beverages of the alcoholic type,putting the truck out of service doesnt give you permission to go drink,you must take yourself off the truck,then you wont be elligible for a random,also,the only time you will get a breathe test is if you are in an accident and get sited for that accident,randoms are mostly for drugs.
I once had a team working for me,I had an idea they were doing drugs,but couldnt get them into a drug test,company said if their names dont come up,cant call them up,company is liable for a suit if they pass ok