Well the argument seemed to go "will it be both sexes able to access?" "Yes but that may not be good because men could use that to play the system and we're trying to save women's lives here" to paraphrase very roughly. I wasn't trying to derail the argument about the possiblity of seeing criminal records but rather respond to a specific assertion.
Anyway, my stats were out of date, (80s when there was more parity in spousal homicide). Having now found my favourite recent review which deals with all forms of violence nice and systematically, the latest data it has from Canada and the US is showing a 20:80 female:male perpetration rate for spousal homicide (vs violence which is more equal). Table below.
So (extrapolating from north america here) one man every fortnight is murdered by his partner. Not that I think this potential legislation would change that anyway.
Canada, 2003 (Statistics Canada, 2005)
23%
Fiji, 1982-1992 (Adinkrah, 2000)
14%
U.S. Supplemental Homicide Reports, U.S. 1976-1985 (Mercy & Saltzman, 1989)
44%
U.S. Supplemental Homicide Reports, U.S.,1998 (Rennison & Welchans, 2000)
38%
U.S. 2009 (Federal Bureau of Investigation, 2010)
20%
U.S. Supplemental Homicide Reports, for African Americans 1985-87 (Plass, 1993)
51%
U.S. Chicago, 1965-1996 (Breitman, Shackelford, & Block, 2004)
48%
Median
38%