My first thought, admittedly, was "who hides their bike under a tarp?... probably somebody who had stolen it."
Second thought was - how hard is it to get a warrant?
Actually, lots of motorcyclists store their legally-owned, not stolen motorcycles outside under a tarp or cover to protect it from the elements and prying eyes when it’s not in use. This is such a commmon practice that outdoor covers are stocked in every Walmart in America.
One of my two motorcycles is stored indoors, the other is sitting outside right now with a cover on it.