A last-minute twist that caught advocates by surprise is threatening to derail legislation to create new federal resources for those with autism and other developmental disabilities who are at risk of wandering.

The bill known as Kevin and Avonte’s Law would expand an existing program designed to help those with Alzheimer’s disease who are prone to bolting to include kids with developmental disabilities too.

The legislation, which was approved by the U.S. Senate in July, would authorize $2 million annually for the U.S. Department of Justice to issue grants to law enforcement agencies across the country to provide tracking devices, training and other resources to address wandering.