This allows people to check the police record of their (prospective) partners to see if they have a history of domestic violence. It sounds reasonable in that its aim is to protect women from violent men, but who will use it, and when?
Will it be used by women on a random basis as a sort of assurance that their latest boyfriend is 'safe', or will it be used by those who suspect they have something to fear?
If it is the first group it will have created another, male, bogeyman on every corner and a breakdown of trust in a relationship. Imagine how you would feel if you discovered that your other half had secretly done a police check on you.
If it is women from the second group shouldn't they be taking steps to get out of the relationship asap? Doing a police check, if they are found out, could put them at greater risk than they already are and they will still have to break off contact.
I am not sure that it is the best law ever dreamed up.