Note that the table recognizes the possible invasiveness of the urine test.
Also note that this table does not include more recent testing advances, in particular screens for ethyl glucuronide (EtG). The substance is produced by the body after it metabolizes alcohol. The use of EtG screens are being considered by the Pequannock School System to detect use of alcohol up to 48 hours prior to the test.
There is controversy swirling around screening for EtG. Drug testing can result in false positives. The Wall Street Journal published an expose last August that stated urine-alcohol screens are so sensitive that one can test positive from hand sanitizer, cough medicine, household products containing alcohol, and even vanilla extract! (Imagine baking cookies on Friday night and testing positive for alcohol on Monday.) False-positive results can be devastating to a student. The drug and alcohol testing industry products are, for reasons unknown to me, free from federal regulatory approval. Thus, when the Substance Abuse and Mental Health Administration (SAMHSA) issued an advisory warning that the urine-alcohol screen is so sensitive that it can yield a false-positive result, no binding authority existed to enforce sanctions.
School administrators are confident that they can "adjust" the sensitivity of the screens to guard against false positives. I do not know enough about these tests to know if this is possible or not. I will talk with professionals about this issue and update this post when I know more.
Procedures for Testing
The procedures for testing should have checks and balances to safeguard against false-positives and to limit the invasion of privacy to the student. The Institute for Behavior and Health, Inc. is an organization that is pro-RDT. It's president is Robert L. DuPont, M.D. The Institute published a report detailing how to choose which drugs to test for, the frequency of testing, a primer on cost, and other topics. It does not give any advice or procedures to follow to ensure the student's privacy nor how to safeguard against false-positives. I found it curious that ensuring students can't cheat trumps any concern about student privacy.
Drug-Free Schools Coalition is an organization headed by David Evans, Esq., who is pro-RDT. Mr. Evans gives some information regarding student privacy. But he claims that a three step process ensures against false positives.
David Evans, Esq. (who spoke at the Kinnelon forum on January 23, 2007), has published a document that you can read by clicking here.