[@Krash]
Oh, my mistake.
Anything that is available now, real world. Then, anything 'experimental/futuristic' really comes down to judgement. If it feels too much to you, just run it by me here or a PM. If I read it in the story, I might ask for you to clarify or change it—no big deal. I'm very flexible. A decent guideline is to avoid tech that trivializes the task/mission at hand.