Criminal and juvenile law matters.

Provides that the alteration or obliteration of certain markings on a firearm is a Level 5 felony. Provides that the possession of a firearm with altered or obliterated markings is a Level 5 felony. Requires a defendant to serve the sum of all executed time imposed under consecutive sentences before serving any suspended part imposed under consecutive sentences. Prohibits a person who has, after June 30, 2020, been adjudicated a delinquent child for committing an act while armed with a firearm that would be a serious violent felony if committed by an adult (serious delinquent) from possessing a firearm unless the person is at least: (1) 26 years of age, in the case of less serious acts; or (2) 28 years of age, in the case of more serious acts. Makes possession of a firearm by a serious delinquent a Level 6 felony, and increases the penalty to a Level 5 felony for a second or subsequent offense. Requires a juvenile court to transmit certain findings to the office of judicial administration for transmission to the National Instant Criminal Background Check System (NICS) upon a finding of delinquency for an act that would be a serious violent felony if committed by an adult. Allows a court to consider the certain factors when evaluating a petition to expunge certain juvenile adjudications. Beginning January 1, 2021: (1) requires the office of judicial administration to collect and publish certain statistics related to the confiscation and retention of firearms; and (2) requires a court to provide certain information to the office of judicial administration after issuing a finding concerning a person's dangerousness. Provides that a person who knowingly makes a false report that another person is dangerous commits false informing, a Class B misdemeanor. Makes a technical correction and conforming amendments.