Final answer:
DEA Form 106 is the required form used to report theft or loss of controlled substances by registrants with the Drug Enforcement Administration.
Step-by-step explanation:
DEA Form 106 is used to report the theft or loss of controlled substances. This form is a regulatory requirement for registrants with the Drug Enforcement Administration (DEA) when they discover that controlled substances have been stolen or have gone missing. Prompt reporting is essential to comply with federal regulations and to enable an effective investigation into the theft or loss. An accurate and timely report also helps in identifying and addressing any potential patterns or vulnerabilities that may exist within a registrant's controlled substances management system.