I came across our local DEA agency who request us to suggest to them some sort of video surveillance to be mounted on some kind of aerial remote controlled helicopter or something that can float but has to be small enough not to attract too much attention to the perpetrator while the DEA crew on the ground level able to see the live feed and record this UAV feed.
I know there are military versions of that, but that would be an overkill and way overbudget. Any suggestions?