Do you want to wear an on-body camera while on duty?
Night vision gear is still a lot more expensive than a flashlight, even though prices are falling and the gear is more portable and better-performing than ever before.
The category of devices called "night vision" and "thermal imaging" are used in similar settings and often for similar purposes. Even so, they are distinctly different in both the way they operate and in their capabilities.
Advances in thermal imaging and night vision equipment are making these great law enforcement tools less expensive and easier to use.