How do they provide an extra layer of protection against fraud?

What else can you do to add an extra layer of protection?

She could never be sure how many other layers of protection were left.

You'd think someone in Michael's position would have layers of protection, but that wasn't the case.

"With multiple layers of protection you have a backup system," he said.

But now, at last, all her layers of protection were breached.

I discovered one more layer of protection quite by accident last year.

That would add an extra layer of protection in case you were to lose your key.

But it was large enough now that Peter could afford to pay for a few layers of protection.

Several layers of passive protection are provided by the mother.