I really am not sure how the laws would apply to such taps. I just know that they are sneaky fuckers and the laws are not anywhere near up to date with technology. They are like the police tactics version of analog drugs. GPS is illegal to put on cars without a warrant? Who cares we can follow cars with license plate cameras without warrant. License plate tracking without warrant is illegal? Who cares we can track cell phone positioning. Cell phone positioning without a warrant is illegal? Who cares we can have a mini UAV lock onto the vehicle and follow it around. Mini UAV surveillance without warrant is illegal? Who cares we can blah blah etc.