Those sound more like attempts to control his behavior.
Boundaries are for you. To control your behavior. Try making I statements...
And boundaries also have consequences... what are YOU going to do to maintain your boundaries?
An example of a control statement:
You cannot use drugs or take more methadone than prescribed to get high.
An example of a boundary:
I will not allow people who I suspect are under the influence of mind altering chemicals in my house. I will ask them to leave immediately. If they do not leave I will call the police and have them escorted out.
Focusing on your own recovery, rather than trying to control his behavior, will be very beneficial to you. Work the recovery you wish he would work.