The investigation into two controversial lottery jackpots in Texas had drummed up questions about the role of online ticketing firms known as lottery couriers in the state – and nationwide.

Courier services take orders online or through an app, purchase lottery tickets from a retailer and send a scanned copy to the buyer.

Texas Governor Greg Abbott has called for a Texas Rangers investigation into unusual lottery ticket purchases and a multimillion-dollar prize claim to ensure integrity and legality in the state's lottery system.