You should definitely disclose, even if your record has been expunged. Eventually when you go to take the Bar, you will go thru a super-extensive application that will require you to disclose ANY arrests, convictions, etc., and the Bar is considered a law enforcement agency, which means they have access to EVERYTHING - whether expunged, sealed or open...
As long as you own up to your 'mistake', show (thru examples) that you have devoted yourself to beneficial activities since then, and don't try to make excuses, you should be fine. The most common infractions seen on law school apps are: DUIs, underage poss. of alcohol, poss. of marijuana and disturbing the peace/noise violations. 2 counts of paraphernalia are REALLY not a big deal and aren't going to keep you out of law school.
Final Note: Look at some of the U.S. Presidents: Clinton has admitted to smoking pot (although "without" inhaling), G.W. Bush has admittedly smoked pot AND done his fair share of cocaine, and Obama also admits that he's smoked pot (AND admits to inhaling, because as he put it, isn't that the point?
). Just be honest and tell-all now to avoid questions of sneakiness/dishonesty 3 years from now!