After months of negotiating, the NFL and NFLPA have announced that the two sides have finalized the latest revisions to the league’s substance-abuse policy.

The new policy, which went into effect on Friday, officially means that the suspension of Browns wide receiver Josh Gordon has been cut down from a full season to 10 games.

This isn’t to be confused with the NFL’s performance-enhancing drug policy, which was finalized on Wednesday. That policy allowed players like Wes Welker, Orlando Scandrick and Stedman Bailey to return their teams in time to play this week.

“With these changes, the NFL and NFLPA once again have the finest and most comprehensive set of drug policies in sports,” NFL Commissioner Roger Goodell said in a statement.

Under the new substance-abuse policy, a player won’t be suspended for marijuana use until after a fourth failed drug test. A player would have to test positive for marijuana six times before facing a one-year band. Also, a first-time DUI offender will be subject to an automatic two-game suspension without pay.

Here are the key changes to both substance-abuse policy and the PED policy, which will also involve HGH testing for the first time:

• HGH testing will be fully implemented this season. Information on testing procedures will be sent to clubs and players within the week, and testing should begin by the end of this month.

• Appeals of positive tests in both the substance abuse and performance enhancing drug programs (including HGH) will be heard by third-party arbitrators jointly selected appointed and retained by the NFL and NFLPA. Appeals will be processed more expeditiously under uniform rules and procedures.

• Discipline of players for certain violations in the 2014 league year will be adjusted by certain aspects of the new policies. Wes Welker of the Denver Broncos, Orlando Scandrick of the Dallas Cowboys and Stedman Bailey of the St. Louis Rams were eligible to return to their teams this week. Josh Gordon of the Cleveland Browns — and free agent LaVon Brazill — will be eligible to return after 10 games.

• Discipline for violations of the performance enhancing drug policy (including for HGH) will be modified.

• A first violation will result in a suspension without pay of up to six games depending on the nature of the violation. Use of a diuretic or masking agent will result in a suspension without pay of two games. Use of a steroid, stimulant, HGH or other banned substance will result in a suspension without pay of four games. Evidence of an attempt to manipulate a test will result in a suspension without pay of six games.

• A second violation of the steroid policy will result in a suspension without pay of 10 games. A third violation will result in banishment for a minimum of two years.

• Players who test positive for banned stimulants in the offseason will no longer be suspended. Instead, the player will be referred to the substance abuse program. Players who test positive for banned stimulants during the season will continue to be suspended without pay for four games.

• In cases involving discipline for violations other than positive tests (for example, a violation of law), the Commissioner will retain his current disciplinary authority. A player will have a right of appeal based on due process issues or a claim of disparate punishment. This appeal will be heard by a member of the existing CBA Appeals Panel.

• Two discipline stages will be added for marijuana positives. A first violation will result in referral to the substance abuse program, as is the case today. Subsequent violations will result in a two-game fine, a four-game fine, a four-game suspension, a 10-game suspension, and one-year banishment. The new stages are the two-game fine and the 10-game suspension. In addition, the threshold for a positive marijuana test will be raised from 15 ng/ml to 35 ng/ml, reflecting recent actions taken by other testing organizations.

• Discipline for DUI and related offenses will be increased. A first DUI offense, absent aggravating circumstances, will result in a two-game suspension without pay. A second offense will result in a suspension of at least eight games without pay. In either case, a more lengthy suspension may be imposed if there are aggravating circumstances.

• Players currently serving one-year suspensions for a marijuana positive will have their suspensions reduced to 10 games.