Comment by gchamonlive

  The law likely violates the U.S. Constitution’s prohibition on passing laws that significantly burden businesses and people outside Utah’s borders.
  SB 73 burdens the rights of all internet users outside of Utah because it requires adult websites to either know every visiting user’s physical location, and then block those in Utah, or to verify every visitor’s age just in case they might be in Utah.

It's technically impossible to both implement Utah's law and respect the constitution. To make it technically feasible you'd need to either change the constitution or federalize the law.