use behind the wheel goes into effect on friday. >> kim dacey has the details this morning. she is live on federal hill. >> the law makes it a secondary offense to hold your cell phone while you are driving. now you have to buy a handsfree devices. the best buy in glen bernie was packed yesterday. todd heap stopped by to have people comply, and also to sign autographs. law enforcement's know just how dangerous it distracted driving can be. >> i have a firsthand experience when a family member was in a crash. it was attributable to the use of the cell phone while driving. >> anything we can do to help focusing on the road will make a difference in the jobs. >> maryland will become the