On: Drug cartel assassinates its enemies with bomb-tot...

[kortex]

Then you just get stealth drones (fixed wing). Bondo, styrofoam, electric ducted fans, frequency hopping radio links, all easily doable. Only hard part really is range. For that, I could see hybrid electrics that power down the gas/nitro engine for stealth.

[sudosysgen → kortex]

Or even just a gas turbine, as RC people already use. 10:1 TWR, relatively cheap. Quite loud, but works at high altitudes.

[meheleventyone → sudosysgen]

Small gas powered drones for the military are already pretty common.