The majority of candidates I've interviewed do not have code they can show me. Usually because they don't have permission to share code from their previous job

The majority of candidates I've interviewed do not have code they can show me. Usually because they don't have permission to share code from their previous job. The idea of these questions is to filter out those that cannot program at all; any competent programmer should be able to solve these; or at least talk about them for a while. The point is to avoid making a bad hire; not to find an excellent person.