Andrew's attorney points to a Minnesota law that protects people who might be committing drug crimes from being prosecuted if they call 911. The idea is to give people an incentive to help others in dire need without fear of prosecution.
Here's the problem. Under the law, the person who calls 911 does NOT get immunity if they receive or expect to receive compensation for picking up the phone and making the call. It's unclear if Andrew and his dad were going to get paid, but the recovery center charges for its services, so it's a good bet they were expecting compensation.
As for the drugs in the backpack ... even if Andrew's dad prescribed the drug for Prince, our DEA sources say it's illegal for anyone to take the drugs across state lines and deliver drugs in states where the doctor is not board certified.