1.   But a complete justification of authority has to do more than to provide valid reasons for its acceptance.

2.   But there are also valid reasons for optimism.

3.   I had a perfectly valid reason for being there.

4.   Liberty is proposing regulations, including a rule requiring anyone installing cameras to supply the authorities with valid reasons for doing so.

5.   The desire to persist in interrogation is a valid reason for keeping a suspect in custody for thirty-six hours and indeed beyond.

6.   There are many valid reasons for this as the logistics of organising a journey around Britain are complicated.

7.   Police officers must have a valid reason for stopping motorists.

8.   They put forward many valid reasons for not exporting.

9.   There is no valid reason to proceed with the change.

10.   All of these can be viewed as valid reasons for changing a contract.