Cyborg Tissue and Replicants...

http://io9.com/5938221/researchers-grow-cyborg-tissue-that-can-sense-its-environment ,
http://terminator.wikia.com/wiki/Living_tissue ,
http://www.genengnews.com/gen-news-highlights/sensing-cyborg-tissues-now-feasible

Of course robots with human camouflage would be ideal for infiltrating and that could be very dangerous.

https://en.wikipedia.org/wiki/Impostor_(2001_film)#Plot 

http://en.wikipedia.org/wiki/Replicant , http://bladerunner.wikia.com/wiki/Replicant ,
http://io9.com/5181048/blade-runners-original-ending-yes-deckards-a-replicant ,
http://entertainment.howstuffworks.com/replicant.htm

https://thedigitallabyrinth.blogspot.com/search?q=Blade+Runner

https://thedigitallabyrinth.blogspot.com/search?q=cyborg