NRL bosses confirmed on Tuesday that Addo-Carr would be sanctioned over the incident, after he fronted the integrity unit last week.
Under the game's rules, head office does not publish the details of sanctions, however it is expected to sit at close to a four-game ban along with a fine.
Addo-Carr has continued to claim he does not know how the cocaine that was detected at a roadside test this month got in his system, arguing he did not take illicit drugs.
The 29-year-old has until next Tuesday to respond to the breach notice, but realistically his bigger battle looms at the Bulldogs.
Canterbury bosses are yet to decide what action they will take against him, but there remains every chance he has played his last game for the club.
Josh Addo-Carr makes a break against Manly in what could have been his last game in blue and white. (Dan Himbrechts/AAP PHOTOS)
Bulldogs supremo Phil Gould said last week that it was too soon to say whether Addo-Carr would be shown the door.
"I believe he's still protesting his innocence but at the end of the day, it's in his system when he takes the drug test," Gould said last week on 100% Footy.
"How it got there, he needs to work that out and explain that to the people that count.
"(The board) may or may not take my recommendation. They may or may not have another point of view.
"At the end of the day, we'll do what we think is in the best long-term interest of the club, it's as simple as that, and all the players understand that: club first, team second, individual third. That's what we'll do."
Addo-Carr has already accepted a $682 fine from NSW Police and three-month ban from driving over the incident, after his roadside test on September 6.
The test also prompted him to stand down from Canterbury's elimination final against Manly, which they lost 24-22.
Any ban handed down by the NRL would extend into Addo-Carr's time at another club, if he was to be sacked by the Bulldogs and signed by a rival.
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