But there is no foolproof method to avoid becoming ill.

A foolproof method of getting round this is to use film.

He said his company had foolproof methods to prevent overstocks of books from "going out the industry's back doors."

It wasn't a foolproof method, but it caught quite a few.

Burning down the factory would have been a pretty foolproof method.

Her foolproof method takes months, sometimes even years to work its magic, but Nick has just one week.

This is a foolproof method that makes no last-minute demands on the cook.

It was a foolproof method of murder, used by the Communist intelligence service.

And so the shortstop considered a more direct, foolproof method of delivering his message.

One final foolproof method of interacting with people on the road is to play with the local children.