Although Many Legitimate Businesses Sell Their Wares Through Contact With Customers At Their Homes, Bristol Tennessee Police Are Urging The Public To Be Cautious Of Some People Who May Be Using Door To Door Sales As A Way To Case Homes And Select Victims. Within The Past Two Months, Lt. Charlie Thomas Said They Have Investigated Two Residential Burglary Cases In Which The Victims Said Someone Attempted To Sell Them An Alarm System, But Came Back Later And Burglarized The Residence. Thomas Said Homeowners Should Verify The Identity And Employment Of Anyone Coming To The Home, Do Not Let Strangers Into The Home, And Record The Make, Model, And Serial Numbers For All Expensive Items In The Home.