Critics of the group call the $300 payments coercive and the nationwide effort racist. From where Barbara Harris sits, drug addicts give up a lot of things. Procreation should be one of them. The founder and driving force behind the controversial Project Prevention is on a 5,000-mile road trip to bring the group’s distinctive offer to the nation’s drug users: Get on long-term birth control. Maybe get sterilized. Either way, get $300 from her group. “People say we don’t have a right to tell them how many children they can have,” Harris said Tuesday as she coaxed the nonprofit group’s...