Per Adam Scheffter according to
With the deadline for using the franchise tag looming at 4:00 p.m. EST on Thursday, the Cowboys have used theirs on safety Ken Hamlin, according to Adam Schefter of NFL Network.
Hamlin signed a one-year deal with the Cowboys last year during free agency. He started in every game, and had a career-high five interceptions.
The move might have been prompted in part by the decision of the Vikings to cut safety Dwight Smith, since the Vikings might have pursued Hamlin aggressively in free agency.
The use of the tag on Hamlin also means that left tackle Flozell Adams will become an unrestricted free agent.