Top prosecutors from across the country, including New York, Texas, California and Massachusetts, have thrown their support behind a Philadelphia-based nonprofit’s efforts to open the country’s first safe injection site.

Attorneys from Wilmer Cutler Pickering Hale and Dorr and Hangley Aronchick Segal Pudlin & Schiller filed an amicus brief Wednesday on behalf of 64 current and former law enforcement officials, who contend that federal law should not bar the nonprofit Safehouse from opening a safe injection site. The brief was one of several filed Wednesday.