Your question doesn't specify, but for purposes of this answer I'm going to assume you are fearful of be charged with a controlled substance violation. Most drug offenses are based on an element of possession. Being the lessee of property is just one factor that the police and courts will look at in determining whether a person is in actual possession of controlled substances. For example if you lease premises where controlled substances are found and you have exclusive control over those...
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I would go to the Clerk's Office in the County where it occurred and have them do a record check on you. There is a charge for this. They will give you a print out that shows anything that they have on you. From this you will be able to detemine whether or not you were convicted.