Sergeant1107 wrote on Dec 6^th, 2008 at 6:17am:

I disagree. I think you should call the department or agency to which you are applying and speak to your background investigator prior to your CVSA.  Tell them about your omission and don't try to conceal it. If the sum total of your illicit drug-using experiences is eating a marijuana brownie while in college, that is not a disqualifier for any law enforcement agency with which I am familiar.  However, lying about it will likely DQ from most, if not all, agencies.

It might be particularly problematic for an IC agency or the FBI.
BTW, your attempting to characterize ingesting a marijuana-laced brownie as something inconsequential is not entirely accurate.  "Cooked" marijuana as an ingredient in foodstuffs is far more potent than, say, smoking a joint or "bong"! :)