The procedures stipulated for these securitizations are labor-intensive. Each loan has to be signed over several times, first by the originator, then by typically at least two other parties, before it gets to the trust, “endorsed” the same way you might endorse a check to another party. In general, this process has to be completed within 90 days after a trust is closed.

Evidence is mounting that these requirements were widely ignored. Judges are noticing: more are finding that banks cannot prove that they have the standing to foreclose on the properties that were bundled into securities. If this were a mere procedural problem, the banks could foreclose once they marshaled their evidence. But banks who are challenged in many cases do not resume these foreclosures, indicating that their lapses go well beyond minor paperwork.

Increasingly, homeowners being foreclosed on are correctly demanding that servicers prove that the trust that is trying to foreclose actually has the right to do so. Problems with the mishandling of the loans have been compounded by the Mortgage Electronic Registration System, an electronic lien-registry service that was set up by the banks. While a standardized, centralized database was a good idea in theory, MERS has been widely accused of sloppy practices and is increasingly facing legal challenges.

As a result, investors are becoming concerned that the value of their securities will suffer if it becomes difficult and costly to foreclose; this uncertainty in turn puts a cloud over the value of mortgage-backed securities, which are the biggest asset class in the world.

Other serious abuses are coming to light. Consider a company called Lender Processing Services, which acts as a middleman for mortgage servicers and says it oversees more than half the foreclosures in the United States. To assist foreclosure law firms in its network, a subsidiary of the company offered a menu of services it provided for a fee.

The list showed prices for “creating”  that is, conjuring from thin air  various documents that the trust owning the loan should already have on hand. The firm even offered to create a “collateral file,” which contained all the documents needed to establish ownership of a particular real estate loan. Equipped with a collateral file, you could likely persuade a court that you were entitled to foreclose on a house even if you had never owned the loan.

That there was even a market for such fabricated documents among the law firms involved in foreclosures shows just how hard it is going to be to fix the problems caused by the lapses of the mortgage boom. No one would resort to such dubious behavior if there were an easier remedy.