Ok, so I have a techmarine in my group who has an augur array implant, and it's making things kind of difficult for me. I'm putting the rules text in here for reference:
" These devices are used to detect energy emissions, motion, and biological life signs. A character using an auspex gains a +20 bonus to Awareness Tests and may make a Tech-Use Test to spot things not normally detectable to human senses alone, such as invisible gases, nearby bio-signs, or ambient radiation . The standard range for an auspex is 50m, though walls more than 50cm thick and certain shielding materials can block the scanner. "
So here's my issue: I would like to use environmental hazards, surprises, etc. in my missions (e.g. I think genestealers are fun), but my techmarine is constantly asking to "scan for life signs" or "scan for motion" whenever they are about to move into a new area. Being a Techmarine, passing the Tech-Use test is pretty much guaranteed for him, and I feel a bit frustrated with how that seems to rule out a huge number of options for me.
On the other hand, I don't want to be constantly making up excuses for why the auspex won't work (one player even made a joke about this, asking "is this one of those situations where it doesn't work because... reasons?")
So my questions are: how do auspexes get used in your games, typically? What do you consider acceptable parameters for what they can/can't do? Any suggestions for how I can handle this without making my player feel like I'm singling him out/hitting him with the nerf bat?