Malik McDowell -- the ex-NFL D-lineman who attacked a cop during an arrest earlier this year -- is in more trouble ... he's back in custody after a judge ruled he intentionally tampered with his ankle monitor.
McDowell has been fighting multiple charges stemming from his February arrest where he got violent with a police officer ... but he had been out on bond while his case played out in the Michigan court system.
But TMZ Sports has learned McDowell was ordered to be back in custody after a judge ruled he violated the terms of his bond.