Just because this is designed to illegally search people to see if they're armed, it doesn't mean it won't also be used to illegally look at your naked body. Perhaps it'll also be used to illegally search you for things that unscrupulous people will want to steal from you. Such people can also be cops (although they wouldn't have to be, merely controlling such a device).
Police are people too. They have the same desires, same temptations, and same inclinations as the average person, assuming they're not insane, in which case they have other inclinations and temptations as well.
No entity in this country should have this ability. Under no circumstance should these be deployed. No more scanners in airports. No future scanners in schools. No scanners for the police. These do not make people safer, they simply put money in their creator's pockets. Whether or not they induce cancer isn't even on my mind.
If the people who have them aren't permitted to strip search you, then they have no business doing so electronically. Metal detectors and chemical detectors are the way to go. It's fine to detect bombs, it's wrong to strip search people for the fun of it.