There is a FDA approved "smart pill" technology in the works that has a small sensor in it that is activated when it hits the digestive enzymes. Allowing family to know whether their loved ones are taking their meds.

https://www.npr.org/sections/thetwo-way/2017/11/14/564112345/fda-approves-first-digital-pill-that-can-track-if-youve-taken-it