Funny, he had a govt issued phone.
I once worked, a long time ago for the Feds, and as everyone who has will confirm, you are made to sign all sorts of shit regarding issued com devices.
All of these docs tell you explicitly these 3 things and often have many more restrictions depending on they type of com equipment issued:
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Devices are to ONLY be used for conducting govt business.
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You have no assurance of any privacy on these devices.
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Any and all coms made using said devices are under complete jurisdiction of the govt.