Michael Floyd Tests Positive for Alcohol ... During House Arrest

Bad news for Michael Floyd ... the Minnesota Vikings WR tested positive for alcohol during his house arrest this week, TMZ Sports has learned -- and it could mean jail time for the NFL star.

A rep for the Scottsdale City Court confirms ... Floyd's alcohol monitoring system flagged 5 events during June 11th and 12th. At least three of the events were described to us as "high alcohol tests."

Floyd is not supposed to have a single drop of booze while on house arrest, as part of the sentencing in his Arizona DUI arrest from Dec. 2016, when he was found passed out behind the wheel of his car.

As we previously reported, Floyd begged the court to remove his alcohol monitoring ankle bracelet because…