The Texas Lottery on Monday banned online lottery ticket sales by third-party courier services after Lt. Gov. Dan Patrick and lawmakers had questioned the practice. The policy is effective immediately and “aligns with legislative efforts to address serious concerns raised by players and state leadership regarding the integrity,

The Texas Lottery Commission announced Monday morning that it is moving to ban courier companies days after Texas Lottery Commissioner Clark Smith resigned amid growing pressure from top Texas lawmakers who are investigating the system.

The Texas Lottery Commission is targeting couriers who buy large numbers of tickets to rig the lottery. This crackdown follows accusations that couriers help big money groups guarantee wins by purchasing every possible combination.