> However we use our tech only to deliver souvenir photography to event attendees. We will not sell it to government.

Do you have a warrant canary or similar in place?

How hard is it to defeat the "live face" thing and get your system to search for someone else using a photo or something? Could I use a video of someone I want to track?

I'm just playing devil's advocate here. Your service and tech looks awesome if you continue to provide it ethically, it just seems like there are a bunch of ways that services of this kind could be exploited.