A few years ago, there was a big case where Massachusetts tried to force (non-internet) retailers in New Hampshire to collect Massachusetts state taxes from peo

A few years ago, there was a big case where Massachusetts tried to force (non-internet) retailers in New Hampshire to collect Massachusetts state taxes from people who purchased things in New Hampshire that might in the future be used in Massachusetts. The case got thrown out by the state supreme court because to enforce it would require Massachusetts to force New Hampshire businesses to violate their customers' privacy about where products would be used. New Hampshire in turn passed a law prohibiting retailers from sharing private customer information with Massachusetts auditors. Trying to make the citizens of one state liable for enforcing the laws of another seems ridiculous by itself. Making them enforce the thousands of arbitrary, convoluted, constantly changing laws of 49 other states and all of their localities is way beyond reasonable. At least there appears to be a clause that states will have to simplify their tax rules and provide free software to manage it. Although the idea of integrating an e-commerce system with 50 separate bureaucratically-designed systems doesn't really seem that appealing either... If the states also had to pay for every integration and the maintenance of all e-commerce software, then it would be a little more reasonable.