This is from an article in USA Today: "Ten U.S. tourists have died in the Dominican Republic since March, some reportedly after drinking alcohol from hotel minibars. The deaths resulted in the Dominican Republic Ministry of Tourism elevating safety regulations and enforcing food and drink inspections."
There have also be 25 deaths due to tainted alcohol reported in Costa Rica this year and there is talk of the same problem in several Mexican resort areas.
This is just an FYI for anyone traveling in the Caribbean. Do some research and be aware.