Establishes a grant program to assist local law enforcement agencies.

Provides for a statewide gang information database.

Provides for an increase in sentences for adults who recruit juveniles, expansion of the list of aggravating factors, and community custody for unlawful possession of a firearm.

Makes subsequent convictions of malicious mischief 3 a gross misdemeanor offense.

Provides for a civil cause of action for graffiti and tagging and defines criminal street gangs.

Requires a study on best practices to reduce gang involvement while incarcerated.

Provides preemptions for certain definitions used in the act.

Requires the department of community, trade, and economic development to establish a temporary witness assistance grant program for witnesses of felony criminal street gang-related offenses.