"I asked you about why roving wiretaps should be disallowed."
Not disallowed completly, you just need a warrant. The thing is it allows for way to much abuse when a the government can wiretap peoples' phones for no good reason. And that is what a judge's warrant requires, reason and enough evidence for a wiretap. I don't care what the government "thinks," they shouldn't think nothing. Have some evidence or get off the line.
you still need a warrant (for domestic communications). the questions is - how many warrants? one for each phone a person might use?
Well how about if the phone is receiving an incoming call from a number associated with a Terrorists group?
IF you are talking about the "Domestic" spying claptrap, they had reason. The US persons(which includes non-citizens, and IIRC even those who entered legally (or ostensibly legally) and overstayed their visa) whose *foreign* communications were monitored were linked to foreign terrorists when they either called them or were called by them. After that their calls were monitored in case the foreign persons changed numbers, as they frequently do. Apparently in some cases enough evidence was collected to implicate the "US person" and to indicate that they were in turn communicating to other "US Persons" within the country, in which case a FISA warrant was sought to allow for monitoring their *domestic* communications.