Hormones associated with lactation and breastfeeding can variably and unreliably inhibit processes involved with fertility. While opioids can produce unconsciousness, they do so unreliably and with significant side effects. At this point in her career, "San Juan" was known for being unreliably slow. Other fossils have been found, but many are either unreliably dated or else unreliably identified. He has been unreliably connected with accounts of John Dee and Edward Kelley in Prague.