Make him NOT a replicant?
How about no.
You mean not a replicant like he he wasn't one in the story the book was based on? Blasphemy.
The NSA decrypts all messages to see if they need to read those messages. Those decrypted messages go into a database which, like the cellphone metadata database, is opened to other agencies (the police) to browse. Pretty soon the only messages the police will need a wiretap to gather are those which are easiest to collect.