Some Arizona lawmakers voted to block a measure that would stop people from buying smart guns.
The House bill would prohibit any mandatory tracking technology on guns, but most of Thursday’s debate centered on the idea of who is and who isn't supposed to be able to fire the gun.
Proponents said smart gun technology could prevent shooting tragedies like what happened last week when a little boy was killed by his two year old brother.
But opponents like Senator John Kavanagh said the technology isn’t there yet.
"The finger might be dirty. And when the person needs the gun for self-defense it won't work," Kavanagh said. "The person may be incapacitated and you might want a friend or relative nearby to be able to use the weapon. They would not be able to use it if they were not part of the system."
The House already has given preliminary approval to similar language.
The measure now needs a final roll call vote.