47-year-old Stubblefield was first arrested back in May 2016 for allegedly raping a mentally disabled woman. He was hit with 5 felonies. Bail was initially set at $250k. He immediately posted it and was released.

But in January 2018, prosecutors uncovered evidence they believe proves Stubblefield used a gun to commit the alleged rape. Bail was revoked and he was remanded back into custody on Jan. 19.

He spent the next several weeks locked up in Santa Clara County Jail.

But now, Stubblefield's attorney Ken Rosenfeld has produced evidence he believes proves the accuser lied about her past -- which prompted the judge to reevaluate Stubblefield's bail.

The judge ultimately reinstated bail -- this time at $500,000 -- which Stubblefield posted over the weekend. He was released from custody Sunday morning.

One of the terms of his release ... we're told Stubblefield is required to wear an electronic monitoring device.

Stubblefield has previously denied the allegations -- and has vowed to prove his innocence.