> ...or technically isn't possible in the US without any evidence of such. Most of the times it comes down to constitutional issues in which case they are tech

> ...or technically isn't possible in the US without any evidence of such. Most of the times it comes down to constitutional issues in which case they are technically not possible. Case in hand; the federal government has no constitutional right to prevent the states from collecting taxes -- which would be required for there to be one official Collector of Taxes for all the states.