Internet gambling has become legal in New Jersey and Nevada, but experts say enforcement and regulations still need to be straightened out. Jim Mone/AP hide caption

itoggle caption Jim Mone/AP

Booths that sell paper pull-tab games like this one have new competition in Minnesota: electronic pull-tab games played on iPads. The games are meant to help pay for a new football stadium in Minneapolis. Jim Mone/AP hide caption

itoggle caption Jim Mone/AP