Why it's possible:
- Lucas is back in Rosewood, so he could easily be in on any and all dirty business.
- Lucas has always been a little on the weird and creepy side, plus he's admittedly interested in photography.
- He's shown before that he's obsessed with Hanna. Would he try to get the other girls out of the way to get close to her?
- He's been on the "A" team before! Mona blackmailed him into joining.
Why it's not:
- Lucas was attacked by "A" in season two, just outside Spencer's lake house.
- He leaves Rosewood High because he's afraid for his safety. He's been homeschooled ever since.
- He may be a little weird, but he doesn't seem like he has what it takes to pull off something like this.
Source: ABC Family