I went to Cabo recently, and we stopped at Costco from the airport to load up on our own alcohol. Mostly because I am cheap, not worried about being poisoned. I would be more concerned about the water and ice.
Just saw a blurb on the local news at my parents' house in rural Alabama regarding the subject matter in this thread. They said widespread raids by Mexican authorities at AIs in Cancun & Playa del Carmen yielded over 10k gallons of bootlegged/tainted liquor.
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