Housing Minister Huw Lewis acknowledged that he didn't have a "smart answer" to the potential problem of disreputable mobile home site owners putting forward a respectable site manager as a way of circumventing the fit and proper person test.
He was giving evidence to the local government committee on Peter Black's member proposed bill on mobile home sites on 6 December 2012.
The bill seeks to establish a requirement that the owners of park home sites must pass a 'fit and proper' persons test as part of a licensing system.
Conservative AM Janet Finch-Saunders asked the housing minister who would need to pass the test given that some sites are managed by owners and others by site managers.
Housing Minister Huw Lewis stated that "Peter Black's proposal that the license is held by the site manager is probably the best approach".
This could be problematic according to Kirsty Williams AM as "the issue for residents is having a vicious site owner who puts up a site manager who is fit and proper as a front".
Mr Lewis agreed that this was a potential problem, but suggested that there was no obvious resolution.
He said that he "can't legislate against every cunning plan".
Also giving evidence to the committee were Mike Burtonwood from Bridgend County Borough Council and Environmental Protection Manager of Rhondda Cynon Taf County Borough Council Louise Davies.
Both were happy with the general principles of the bill.
Chair of the UK parliament's Communities and Local Government Select Committee Clive Betts MP also made an appearance.
He shared his experiences of dealing with a similar bill.
Liberal Democrat Peter Black AM first called for the introduction of legislation to regulate the process by which park homes are regulated and sold in Wales in a
members bill debate
on 1 February 2012.