Tre Boston frustrated he’s still a free agent Posted Apr 7, 2019 Veteran NFL safety Tre Boston is one of the dwindling number of players still available in our Free Agent Top 100. He’s frustrated by that. Boston, who signed a one-year deal with the Chargers in 2017 and a one-year deal with the Cardinals in 2018, said he’s getting tired of having to sign “two prove-it deals” in a row and still not having a long-term contract. (NBC Sports)