If anyone ever tried you would not hear about it because that could cause copy cat crimes. Also, the surveillance state we live in is far more capable than you would be lead to believe based on the crimes that are allowed to happen.

For example it would be trivial to have a geo fence around high value targets like these and any time a cellphone signal which does not belong breached it security would be alerted.

And if you aren't transmitting a cellphone signal that alone is suspicious.

These people live on massive private properties in secured areas and everything about them is kept secret. Anyone doing any research gets flagged.