I'm thinking of using the science lab to manufacture undetectable toxins.
That doesn't sound safe at all. What are you trying to make?
I'm trying to make a deadly neurotoxin. I want to use it on my sister because she's an annoying bitch.
You shouldn't be using your position in the lab for evil purposes. Trying to kill anyone is wrong, especially a family member. Even attempting to murder your sister is a serious crime, and you should be arrested for it.
Nah, I think it's alright. I can handle the consequences and I'm not hurting anyone except my sister.
Even if you are prepared to face a long prison sentence, or even execution, it is still not okay to murder your sister. She certainly wouldn't agree to that deal, and no one else should either. I urge you to put an end to this plan immediately.