It appears as though the NFL is finally progressing towards changing its controversial drug policy. According to a NBC Sports story, the NFLPA plans to vote tonight on proposed changes to the NFL’s existing drug policy. The changes, if ratified, may include an increased threshold for which players are allowed to test positive for marijuana. However, the NFLPA first needs to get a proposal from the league itself. According to the NBC Sports posting, that has not happened yet. “The players are prepared…