Each method above can be very successful - or not, depending on how the method was used and by whom. Any true professional bed bug exterminator will tell you that no matter what method of bed bug detection is used, none of them are 100% accurate. Even if it could be certified 100% that there were no bed bugs in a particular unit prior to someone renting it, the new renter could bring the problem in the very next day - or, an existing problem in an adjacent unit could very easily spread to the 'new' one just as easily. There is simply no way (at this time) to 'declare' anything 100%.
This brings us to the next perplexing problem:
Should Toronto bed bug legislation be passed that would require landlords to "Certify a unit bed bug free" - an almost impossible thing to do - a litany of litigation is sure to follow. Tenants will sue landlords, landlords will sue pest control companies, insurance companies will charge more to insure pest control companies against the onslaught of law suits that are sure to follow and they in turn will rightfully pass along that extra cost to the landlords who will ultimately demand that their extra cost of running the building be built into the next rent increase. In the end, it is the tenant that may ultimately pay for this legislation unless the politicians recognize this potential and come up with a way that will thwart it before it manifests itself against the bottom line of every renter in the Toronto area.