Where did the Welcome To The Board, Glad you own a Dodge, warm invite go??
The warm invite (especially to posters like omars121) go out the window when their first posts involve illegally modifying vehicles in such a way to defraud. But, since your a first time poster, and not yelling at us, like omars121 did, because we won't tell you how to rip people off, welcome to the forum, andI hope you can find the Dodge you want.
Like motorider228 said, "The only reason to set an odometer back is to cheat someone." There is no other reason someone would want to do this.
I can't tell you how someone would be able to tell if the mileage "was stopped" on their vehicle, short of getting a CarFax (if your buying it from a dealer, they should give you one for free), and maybe asking to see the service record.
But, yea, "stopping" the mileage is a very, very sleeze-bag thing to do. If you were so worried about the mileage you would rack up, you should have addressed that before you signed the lease/contract, or you should have bought the vehicle outright.