Y'all really haven't thought this trough, have you? So, let's break it down...
NO ONE gets into the lab without Kindra's authorization. The place is literally a fucking sealed vault BUNKER!
Elevator? Hell no! The fucking power is out! Even if the elevator were still operational the lab is a sealed vault!
Cassandra's little thief is currently locked down in the living room with absolutely NO means of escape.
Worst case scenario, the guy turns vandal or tries to swipe some of Kindra's, June's and/or MC's personal shit but the cops will search him once they finally arrive on scene, the power is restored and Kindra lets them in. The details on the secure nature of Kindra's place are outlined in the game's dialogue. That place makes Fort Knox look like easy pickings! Did you miss the steel traps slamming shut over all of the windows and doors when the thief was initially trapped upstairs? That thief isn't going ANYWHERE!
I'm sure I'm coming off like a total prick about now but this has to be the fifth or sixth time I have seen this same debate in this forum. Artemis is locked securely inside her sanctuary/vault/lab and the thief is locked securely upstairs with no way to reach the lab. Any speculation to the contrary is just paranoia. Humble apologies for being such an ass about this subject. Yet, after reading so many of these comments I'm left wondering if any of the folks who made such comments even bothered to read the dialogue in game. Okay... Phat will STFU and end the rant here... We now resume our regularly scheduled forum banter... Have a great day!
Adventure ever on my friends, Phat