Someone please correct me if I’m mistaken, but Narcan (naloxone) is not used for overdoses on non-opiod drugs like meth or LSD. As other commenters have pointed out it specifically binds to opioid receptors, so it’s not going to be useful for a drug that operates via a different primary mechanism. The same goes for THC, which binds to cannabinoid receptors instead. Frankly, I would expect a medical professional to just know this.