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.

Miller was the NFL’s defensive rookie of the year in 2012 after he recorded 11½ sacks and he bettered that in his second season of 2012 with 18½ sacks.

This message was posted on Miller’s Twitter account Monday afternoon: “Seeing reports abt 4 game susp. I know I did nothing wrong. I’m sure this’ll be resolved fairly. Disapp. Broncos have 2 open camp like this.”

If Miller loses his appeal, he likely would be replaced at starting strongside linebacker by Shaun Phillips. The former San Diego Charger signed a one-year, $1 million deal with the Broncos in late April.