Those tests are seriously suspect. Source is By Roger Morgan, Exec Director, Coalition for A Drug-Free California of http://www.stopdruggeddriving.org/
From the PDF link you provided one can click on the link to:
"IBH identifies, develops, evaluates and promotes new ideas to prevent drug abuse. IBH President Robert L. DuPont, M.D., is the founding director of the National Institute on Drug Abuse. Read IBH's: