On April 3, 2013, the NFL announced that Washington would be suspended for the first four games of the 2013 season for violating the league's substance policy. On May 30, 2014, Washington was suspended indefinitely for violating the league's substance policy again. He was conditionally reinstated on April 25, 2017, but was released by the Cardinals a month later.
On May 3, 2013, Washington was arrested in Phoenix, Arizona on two counts of aggravated assault (and one count of criminal trespass in the first-degree) from an incident on May 1, 2013 involving his 27-year-old ex-girlfriend with whom he shares a daughter. The altercation concerned a custody dispute over the 5-month-old child. Phoenix Police accuse him of pushing her with two hands, causing her to fall and break her right collarbone. On March 24, 2014, he pleaded guilty to the crime of aggravated assault, a class 6 felony. Washington was sentenced to one-year of supervised probation on April 23, 2014.