The Midi-chlorian Registration Law was a Royal Law of the Golden Empire, binding on all medical facilities and medical practitioners on the Empire's worlds. It required medical staff attending all live births to conduct midi-chlorian counts on newborns.
From the inception of the Golden Empire in 87 ABY until the law's passage, the Empire had no formal or mandatory system for tracking the births of Force-sensitives. Instead, those who ultimately became Centurions were usually reported by their parents, or self-reported by adults, when they exhibited unnatural or superhuman abilities. The Order of Keltrayu then dispatched Praetor-Recruiters to examine individuals on a case-by-case basis. Queen Rin Sakaros wished to dissociate the Order of Keltrayu from the pre-Imperial Jedi Order and its mandatory conscription, and consequently sought to avoid the perception among her citizens that the Order was spying on their children.
The activities of the Impar serial killer Rha'Ko Celisee changed Rin's attitude. Rha'Ko was able to prey on Force-sensitives who had not been recruited by the Order, and remained one step ahead of the Centurions until he overstepped and attempted to kill Tenebrous and Draze Tynblade. Though Celisee was captured and beheaded, Rin had become aware of threats posed by—and to—undiscovered Force-sensitives. At the 156 ABY Consular Assembly, Rin commanded the Midi-chlorian Registration Law.
By law, the attending physician (or, in the absence of a physician, senior medical practitioner or midwife) overseeing a birth had to obtain a blood sample for midi-chlorian analysis. Hospitals were given instruction in how to conduct a midi-chlorian test. All results were entered into a centralized database maintained by the Royal government; those with midi-chlorian counts high enough to enable the use of the Force were automatically referred to the Order of Keltrayu for further investigation.
Numerous safeguards existed to protect Force-sensitive infants and their families from exploitation. Each medical facility was required to have a dedicated midi-chlorian analysis unit (or, in smaller facilities, an individual technician) to conduct the test. Results were not shared with attending medical practitioners, although parents could obtain final results from the government on request. Disclosing a child's midi-chlorian count or potential Force-sensitivity was a crime punishable by imprisonment in all circumstances; if the child or its family suffered kidnap, enslavement, serious bodily harm, or death as a result of the illegal disclosure, the potential punishment was extended up through death.
Membership in the Order of Keltrayu remained voluntary, and while midi-chlorian counts facilitated Praetor-Recruiters' work, parents remained free to decline their children to the Order. Only the Order could access the final database of potentials; if local law enforcement or the Royal Corps of Gendarmes suspected the activities of Force-sensitives in local crimes, only the Order could pursue such leads, and often Centurions wound up taking over the investigations entirely.