The "fare enforcement" folks are not police, they cannot legally detain you and you are under no obligation to answer their questions. Just like the security gu

The "fare enforcement" folks are not police, they cannot legally detain you and you are under no obligation to answer their questions. Just like the security guard at the front of Best Buy who wants to check your receipt, you can say "no thank you" and continue on. However if you give them your ID or information to write a ticket, it is binding.