"While Canada Pharmacy has some strange business practices (they do not accept credit cards, they sent product prior to receipt of check, they have no ability to track packages sent to customers) they do in fact sell legitimate drugs, at least in the case of the Sildenafil they sent me. Because of prior negative reviews, I actually had one of the pills tested by Drug Detection Laboratories, Inc. of Sacramento CA.
http://www.drugdetection.net/tablets/Viagra%20and%20Cialis%20Outline.pdf
The test cost $200. I consider that money well spent as I am pleased to report the lab verified that what I was sent me was indeed Sildenafil."