In the absence of such reasons, the authorities have a clear duty to probe deeper and, where appropriate, issue bans.

I probe deeper - what was a bit too much?

Two further stories probe deeper into the ethics of justice and vengeance.

He would reply by asking more questions intended to probe deeper into the issue.

The afternoons followed a similar pattern, enabling us to probe deeper into the delta each day and, at the same time, providing a fresh vista to go with every meal.