Mayhew says Slay has “a lot of work to do”

New Lions defensive coordinator Teryl Austin said in January that cornerback Darius Slay has “a lot of room to improve.”  G.M. Martin Mayhew said last week that Slay will need to roll up his sleeves to get there. “He has a lot of work to do,” Mayhew said at the league meetings in Orlando, via…