The NFL fined Cardinals offensive lineman Alex Boone $18,231 for a horse collar tackle, Kent Somers of the Arizona Republic reports.
Washington linebacker Preston Smith intercepted Cardinals quarterback Blaine Gabbert with 1:50 remaining in the first half Sunday. Boone brought down Smith with a horse collar tackle after an 18-yard gain.
It cost the Cardinals another 15 yards, but Washington lost a fumble on the ensuing snap.
The Cardinals lost 20-15.
