Denver,
I just got off the phone with Daniel Levi who's an attorney who handles Canadian clearance issues. He mentioned that if your record was expunged that all you would need is a letter from him and you'll be fine. Even if it has not been expunged but at least 5 years have passed, then you would need a similar letter. The downside is the it will cost about $750. Call him if you have any questions. 1 (888) 947-9445. I hope this helps