How you gonna prove the rangers or the league knew or instructed the doctors to do that? And why would the Rangers want him to exceed a safe dosage. Makes no sense
Well it's not hard to establish what the team doctors prescribed him. If he's an employee of the team (and therefore the league), and he's under their medical care, there's an obligation for them to make sure he's being treated properly and safely. If the team was aware of substance abuse issues with Derek (NYR and MIN both were), and continued to send him to the team doctor to receive large (excessive?) quantities of the medications he had a propensity to abuse, it could easily be called reckless negligence on their part. Additionally, the suit is making claims about the NHL not doing enough to protect enforcers.
I'm not saying I necessarily agree with the family's suit on a personal level. But that's the argument that they're going to make, and I think it's fairly compelling from a legal standpoint (though I'm no lawyer!). It's not that anyone wanted him to overdose, rather that they knew he was at serious risk and continued to provide him more than ample supplies of dangerous drugs. Reckless indifference almost.