If the government of Oklahoma wants to seize prepaid cards from out of state residents they should have good reason for it. If they believe the out of state resident has the intention of committing a crime, one that will hurt the state of Oklahoma, then they would be justified. Otherwise it is unconstitutional.
Prepaid cards are the personal property of whoever is in possession of them. Seizing the money with a warrant negates the due process that a subject is due. Allowing police officers to seize property without proof of crime leads to a greater scope of possible abuse within the department. First it is prepaid money that can be seized then it's property, etc. It seems like a slippery slope.
They don't even have to try to link it to other crimes. All they have to do is assert that they are related, and from that point on the burden of proof is on the person they robbed. The reality will be that they will use it as a tool to accomplish any ends they see fit unless someone makes them stop. It's what they have done over and over and over...
The Fourth Amendment of the U.S. constitution protects all citizens from illegal searches and seizures. Oklahoma's new scanner devices that allow law enforcement to seize funds from prepaid cards is unconstitutional. Someone that has been arrested, but not convicted of a crime, shouldn't have their private property taken by the government. Oklahoma is violating the constitution by seizing the funds of prepaid cards, and this law should be challenged in federal court.