In listening to "Sideswiped" by Kim Harrison, I came across a couple of minor tech bits which sound like they would be useful for modern/near-future sneaky adventures:

Anti-Facial-Recognition Make-Up: This is essentially normal makeup, but applied in such a fashion as to trick the algorithms of facial recognition programs into assigning a lower-percentage match to a person's recorded image. Of course, in a setting where weirdness is unremarkable (such as a nightclub), you could get away with a lot more in the way of effectiveness here than you could elsewhere.

Security Camera Spray Paint: This is designed to make a camera lens foggy enough to frustrate automated facial recognition, yet without altering the transmitted image enough that a typical human guard will notice. It also evaporates without leaving a forensically-detectable trace after thirty seconds.

Richard Aiken

"Never insult anyone by accident." Robert A. Heinlein

"I studied the Koran a great deal. I came away from that study with the conviction there have been few religions in the world as deadly to men as Muhammed." Alexis de Tocqueville (1843)

"We know a little about a lot of things; just enough to make us dangerous." Dean Winchester

"It has been my experience that a gun doesn't care who pulls its trigger." Newton Knight (as portrayed by Matthew McConaughey), to a scoffing Confederate tax collector facing the weapons held by Knight's young children and wife.