Are there ways to fool a drug test or breath alcohol test?

It is a little easier to fool a drug test than a breath alcohol test...

Is it legal to test employees for drugs and alcohol?

The answer to this question is a qualified "yes." There is no federal law prohibiting drug or alcohol testing of employees.

How accurate are drug screening kits which you can perform yourself?

The general range of accuracy is about 95%, which is considered quite good. All drug screening kits have received approval from the FDA.

How long after ingesting drugs can the drug use be detected with a urine drug screen test? (How soon after using drugs can a urine drug screen detect the drug?)

It depends on the drug used and the amount of drug used. The outer limit of detection for the commonly abused drugs is anywhere from two days for some barbiturates, to over a month for heavy, chronic marijuana use.

Is there a breath or saliva test available for detecting drugs of abuse?

There are several saliva test products that can test for drugs of abuse...