In fact, many companies have begun to sell such policies, which have become the fastest-growing type of health insurance sold in recent years.

By far the fastest-growing type of health plan is one that operates a network but will pay something for treatment outside it.

The Internal Revenue Service has said that tax dodges through nonprofit organizations are the fastest-growing type of tax crime.

Private fee-for-service plans, the fastest-growing type, cost 19 percent extra.

Huge unused credit lines create even more vulnerability to what is already the banks' fastest-growing type of loss: personal bankruptcy.

These point-of-service plans have gone from a little-used option to become the nation's fastest-growing type of health plan.

Ms. Hetherington believes that more research is needed on unmarried couples who live together, which is the fastest-growing type of household in the country.

The fastest-growing type of credit card fraud is "theft of identity."

Trafficking in human beings is the fastest-growing type of organised crime.

"We have not collected statistics that are reliable," he said, "but police agencies describe this as the fastest-growing type of urban crime in Canada."