Investigate what? The difference between the NW story and this is that the original NW story had allegations of misconduct to investigate. The only thing here that may even sniff that is the drug test issue, and the story specifically points out that first strikes for street drugs don't carry automatic suspensions, but the team CAN have more strict rules on it. If players were getting passes on more strict non-mandatory drug policies, that doesn't really rise to the level of misconduct.
I guess there could be worse stuff happening behind the scenes but this article doesn't allege anything like that and at that point we're just speculating the same way you could about any program.