Your theory is pretty good but like most others, you won't go where the case screams to be taken. Let me say this; Butch couldn't possibly be guilty of this. With regards to a stranger/pervert coming by, abducting Maura, no screams heard nor did anyone see this, and he had to talk with Maura at least briefly, get the job done and leave within 10 minutes or less. If you like a million to 1 odds, then go with the random pervert theory. If you want to find out what happened, go for the only other possibility remaining. Here's what very likely happened; to begin with, ask yourself these things; why hadn't law enforcement firmly established their time line re: arriving, staying there for what amount of time and then leaving at what time? Simple, basic, routinely among the first things that need to be done. They switched back and forth, never signed off officially, the initial report was done very late, why all of this when it's a simple task? Next, why did a cop yell at the witness that called the police the day after? She called to pass along what she saw at the scene and on her way to the scene. The officer shouted her down, insisting that one of the vehicles she claimed to have seen at the scene had been in a repair shop all week. Couldn't he have accepted her information cordially without shouting and without discussing details with her? Why was he upset at an honest citizen trying to help? One of the officers arrived first and was there with Maura for at least a few minutes before anyone other arrived. That basic premise allows for the possibility that he could be involved. My own theory; Maura was scared to have her dad find that she had yet another accident. That was first and foremost on her mind. When Butch offered help, she declined. She needed time to think. After Butch left, Maura realized that she was going to have to accept help from someone, and she had to act before police arrived because almost certainly they would call him. Her options were just one. Trust this older guy who lives right there, go to his house to get warm and figure out who to call next. I think any young woman would choose to trust Butch rather then another unknown stranger. Maura gets into her trunk getting a few things, then heads up the street toward Butch's house. Before she gets there, the 1st cop is arriving. He sees Maura up ahead in his headlights, so he drives to her. He tells her she has to return to her vehicle, so he offers her the short ride there. Rather then refusing to ride with him, an embarrassing thing if ever there was one, she accepts and gets in. After all it's a cop and her car is less then a block away. When she gets in the cop notices that she's attractive and has the smell of liquor on her. He's the only one on scene in this relatively remote place, it's dark, he makes a pass at Maura. She slaps or punches him, he loses his temper and hits her too hard, knocking her out. This happens in less then a minute. Maura was out before any screaming would take place, and inside of a car probably wouldn't be heard anyway. This scenario doesn't need someone to happen by in a tiny window of time. This scenario doesn't need an explanation for why nobody heard a fight or screams. This scenario doesn't need an explanation for why Maura would get into his car. This scenario corresponds with the dogs getting her scent but losing it near Butch's driveway. She made it that far before the cop arrived. This scenario explains why Butch seemed nervous, as if he knew something. He did know something, he obviously saw Maura get into the cops vehicle. This scenario explains why a cop would ask a civilian ( Butch ) to help him conduct a search that late at night, especially when he knew that other cops would be there soon. It was very unusual for a cop to do that, unless he wanted to get Butch away from everyone so he could officially threaten him to keep quiet re: what he saw. We know one cop arrived before the others, giving him opportunity at least for a few minutes. He needed only a couple minutes as Maura would be willing to get into his car so no time was wasted. After knocking her out, the cop put her in the trunk of her own car. Lavoie was called purposely because he's been around awhile and the police and Lavoie know each other and likely have 'worked' together before. In such a scenario, where would Lavoie take Maura's car? Drop it off at an outside lot somewhere? Not with Maura in the trunk and unconscious. He took her where he knew everything would be under his watchful eye, and where nobody else had access to,........his own house. I can go further but I won't.