Dolphins add 18 rookie free agents

A notable defensive tackle prospect who went undrafted has found an NFL home. The Dolphins signed 18 rookie free agents on Monday, including LSU’s Anthony Johnson, an interior defensive lineman who earned second-team All-SEC honors in 2013. However, the 21-year-old Johnson failed a drug test at the NFL Scouting Combine, according to Fox’s Jay Glazer.…