1, can sirens be heard on the 911 call because the squad arrives
2. That would make three mysterious cars that day. One driving crazy in the afternoon; Kevin's car; and the kidnapper's or someone's car that went up to the house and turned around at he time of the kidnapping? Do I have that right?
No, I went back and listened a while back and no sirens are heard on that first car that arrived at Wetterlings home. He just says, they're here now. Although if Merlyn was inside, and with the dispatcher talking over them, I'm not sure a siren would have been heard on the tape. They may have either cut it off once they reached the cul de sac, or never used one. I almost think they wouldn't have used sirens because they wouldn't want to alert any perp still in the area. No telling if later cars used sirens or not.
But Kevin said he "saw" cop cars go speeding by after hearing it on the scanner, and you'd think he would have said "I heard them" if they had been using sirens. It's never been stated for sure either way though.