I’ve been called for a voluntary police interview – does this mean there isn’t enough evidence?

If the police have asked you to attend a voluntary interview, this means they do not have sufficient grounds to arrest, it does not necessarily mean there is a lack of evidence. The police must apply the legal necessity criteria prior to conducting an arrest, meaning an arrest must be necessary for one or more specific reasons, such as preventing harm, protecting evidence, ensuring an effective investigation, or securing attendance at an interview. The police cannot arrest arbitrarily, they must be able to demonstrate that an arrest is necessary for the investigation in the circumstances.