[fritztastic]

Really sounds to me like all those flimsy excuses are just fabrications to obfuscate an ulterior motive behind the sensors. It's very sinister and dishonest, like the person authorizing their usage and answering questions about that decision either doesn't fully understand why they're doing what they're doing, has no regard for the ethical issues involved with invasive surveillance as well as no concern for misuse of resources, or hiding something. Perhaps all of the above.