Okay. If the lawyer had it confirmed through police or court records, I guess it is true. The reason I asked is that there a good number of people that believe their phones, homes, cars, and lives are under surveillance when they are not. I did not know what we were dealing with here.
And, like the others, I agree that it is highly likely they had a warrant. If they did NOT have a warrant, it is unlikely they would ever admit to any recordings ... which, apparently, they did. However, I suspect the phone has not been tapped for a year because unless this is some sort of federal RICO investigation, most such wiretapping warrants are not going to be permitted to go that long. But, there are rare exceptions.
Your kids had best remain quiet and hire an attorney. if they have wiretaps, they likely have a lot of evidence here. Their attorney can evaluate the case against them and determine if a plea deal is in their best interest or if there is a potential weakness in the state's case that can be exploited.