Von Miller did not test positive for performance-enhancing drugs or recreational drugs this year to trigger his NFL-imposed four-game suspension for violating the league's drug policy an NFL source said Friday.

There are numerous ways for a player to fail the policy. Missing a test or counseling session is a violation. Repeatedly showing up late for tests and behavioral issues also are considered compliance violations of the NFL's intervention program.

Miller was placed in the league's substance-abuse program after he tested positive for marijuana during his rookie year in 2011.

Miller who is appealing his suspension said Wednesday that smoking marijuana is not a part of his life but he declined to talk about the case citing confidentiality.