A criminal investigation is like playing detective. When someone breaks the law, like stealing or hurting someone, the police need to figure out what happened and who did it.
The first thing they do is collect evidence, which is like clues in a game. They look for things like fingerprints, footprints, and DNA. They might also talk to people who were there, like witnesses or the person who was hurt.
Then, they use all the evidence to try and figure out what happened. This is kind of like putting together a puzzle. They figure out what the person who broke the law did, how they did it, and who they did it to.
Once they have all the information they need, they can arrest the person and take them to court. A judge and jury listen to all the information and decide if the person is guilty or not.
Criminal investigations are important to keep people safe and make sure that the bad guys get caught and punished for what they did.