The revised anti-stalking law, passed in June in response to recent high-profile murder cases involving stalkers, took effect Thursday.

The revision, the first since the law was enacted in November 2000, requires the police to explain to a victim in writing if they don't issue a warning to a stalker. It also requires that the police notify a victim when a warning has been issued.

The revision also makes it possible for police with jurisdiction over where offenders live or stalking is taking place to issue warnings and restraining orders, rather than just where the victims live.