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Yes, they can because phone calls are allowed and it is common knowledge that they are taped. Therefore, anything that is said to an inmate is not private nor confidential information. Unfortunate, but true. They are not looking to incriminate anyone else, but can do it if they want to because the taping is completely legal.
Or if you mean getting texts or whatever, that is a yes, as well because they confiscate the phones when someone is arrested. Under most circumstances, if it is on the person, the copes will search it and use the info any way they can to get anyone else.
They do that all the time. They are allowed to look through anything confiscated from a person who is taken into custody (booked) in a jail. They often get numbers, texts, names, etc. and use them to arrest others for drugs, or whatever.
The person can always fight it, though, saying it was an illegal search of the phone. But, not too successful, I think.
Yes, whatever the agreement is to get out of jail. That's how the bondsmen make so much money.