Minor in Possession: Working for a Sting Operatation After a MIP Charge

My question involves criminal law for the state of: Delaware

Hi, a friend under 21 was stopped by police for carrying alcohol in a cup in public. They were given a "Probation Before Judgement Summary". They were given a document describing the PBJ which has the following two points:

"Upon successful completion of the probationary period, the charge is dismissed and no points are assessed to your driver's license."

"You have to plead guilty or no contest to the offense(s) with which you are currently charged in Aldermans Court".

The officer told them that if they agree on a future date to work with them in trying to buy alcohol using a fake ID at a bar, then all of this would "go away".

So my questions:

1.The officer provided no documentation of this undercover option - they said to just email them about it.. sounds strange - what documentation should they provide about this to make sure it's legit?
2. If opting out of option #1, will this all be erased from their criminal record once the probationary period is successfully completed?

Thanks

Minor in Possession: Working for a Sting Operatation After a MIP Charge