Doesn't work for me, I made the Fake Rat, got Banana Peels, but talking to the Security Guy infront of Lab B doesn't make use of them, only after talking to Lelia and that doesn't allow me to pick up the wires because it moves to her scene and afterward guy is back at the door and again no way to get in..
I did backtrack to a save before all that, redid everything and tried the fake rat/banana peel trick on him before talking to Lelia, but as said.. can't drop the damn fake rat!?
Edit: Made it work, before talking to Lelia I managed to go beghind the guy and click door to get in, which is strange cuz he is just infront of it.. extreemely badly done game part imo.