The airsoft lasers I have seen have plastic housings, and everything on the housing is fake... just made to look like the real deal (which it does, from a distance). So, to get a viable unit of good enough quality for social work, you will engineer it to the point that the fake box is a liability, not an asset.
I would think you would be better off starting from scratch, with a solid aluminum housing, than the airsoft deal. Or, converting an existing product.
Also check into 21 CFR (as I recall), which is the regs the FDA uses to regulate manufactured items the emit infrared zoomies. They want you to certify the manufactured product (get their approval) before selling any, and there are several hoops they'd like you to jump through. Components are OK, but an end product has to be blessed. By my understanding a 'conversion kit' would be OK, but a completed product would not.
I'm not so much a 'rules' guy, but it's good to know the ramifications of what you're doing.
~Doug