[@daisedconfused] the implant idea is actually from the Suicide Squad movie, so  kudos to them haha. 

As for the collars/forcefield/implant debate, I just don't like the idea of collars. They seem so primitive, and unless they're used to designate who's a prisoner and who's not, they're kind of unnecessary. With implants you wouldn't be able to tell who's a mal and who's not, but that's where uniforms come in. The collars might be helpful if they have a power-disabling function that can be turned on/off, but that can be done with an implant too. The force field could just be a big wall to keep the powerless mals in while their powers are disabled.