Another interesting topic. I went out on the web and found this page. Scroll down towards the bottom and you'll see that the posts here seem to be pointing in the right direction.
The page:
http://www.willowlaboratories.com/services.html
The verbiage:
5 Panel:
Amphetamines
Cocaine
Opiates
PCP
THC
9 Panel:
The 5 Panel tests plus:
Barbiturates
Benozodiazepines
Methadone
Propoxyphene
*12 Panel:
The 9 panel test, plus:
Ecstasy
Oxycodone
Buprenorphine
*The 12 panel test, plus alcohol, is used by many physicians who are treating their Opioid dependent patients.