1.   All the police have to go on is a grainy, indistinct video clip.

2.   An organisation as big as the police has to turn to scores of different agencies.

3.   Despite complaints about his suitability, officials said they were powerless to stop him because police had no evidence to ban him.

4.   Did the police have reasonable grounds to arrest him?

5.   Do the police have any evidence against him?

6.   Do the police have the resources they need?

7.   Do you think the police have too much power?

8.   Due to a lack of evidence against the suspect, the police had to let the prisoner go.

9.   First, the police must have concrete evidence of an offence.