To be eligible for appointment to the Senate, a person must officially reside in the province which they are being appointed to represent. However, this criterion has historically been interpreted quite liberally, with virtually any form of property holding — including primary residences, second residences, summer homes, rental or retail holdings or even lots of undeveloped land — having been deemed to meet the requirement, as long as the senator listed it as their primary residence on paper regardless of whether they actually resided there in any meaningful way. Again, however, controversy may result among the general public around the definition of residency — for instance, Senator Pamela Wallin faced some controversy in 2008 around whether she was truly a resident of Saskatchewan, although she does own property in the province. In 2013, however, a Senate committee launched a review, ordering all senators to provide documentation confirming their residency status following allegations of irregularities in some senators' housing expense claims, including those of Wallin, Patrick Brazeau, Mac Harb and Mike Duffy.