A PLAYER RETIRES OR IS SUSPENDED FOR DRUG USE OR SOME OTHER REASON. CAN HE GO ON THE INJURED RESERVE?
No. The injured reserve should be just that – a reserve list for players on the NFL’s injured reserve (meaning they are out for the remainder of the season.) Some larger and more sophisticated leagues have gone to the point of creating a Retired-Reserve list and a Physically-Unable-to-Perform list with the designations matching the NFL. In order for that to make sense, your league would probably need to be a keeper league AND a salary cap league. Otherwise, you simply draft, bid upon or keep the players with the knowledge that they have these looming issues.