Individuals have been given the right to find out whether a new partner has been a domestic abuse offender in the past.
The Domestic Abuse Disclosure Scheme is also known Clare's Law after Clare Wood, who was killed in 2009 by an ex-partner who unknown to her had been violent to previous partners.
The provision gives people in a new relationship, or their friends or relatives, the right to ask police whether a new partner has a record of committing domestic abuse with previous partners.
Leicestershire Police will then decide whether a disclosure needs to be made. Any disclosure may be to a different person to the one who submitted the request and it will be to a person who is in the best position to safeguard anyone who is vulnerable.
The provision also allows police to make a pro-active disclosure where officers decide someone may be at risk.
The scheme has similarities to the Child Sexual Offender Disclosure Scheme, which since 2010 has allowed families to find out if anyone in their children's lives has a conviction for child sex offences.
Existing powers to protect victims include prosecution, injunctions, restraining orders, and licence conditions for those convicted of crimes.
Disclosures can be made to cover all types of relationships. They can protect people whether they are male or female, gay or straight.
This measure adds to the wide range of civil and criminal measures that Leicestershire Police and its partners can use to keep people safe.