There has been a new addition to the Bedfordshire police force for one just day.
Lulu De Vries, who's five, has a rare form of cancer. Her family are desperately trying to raise more than £150,000 pounds for life saving treatment in the US.
The family say losing Lulu isn't an option. She's always dreamed of being a police officer and now that wish came true.
- Click to watch a report about Lulu's big day by ITV News Anglia's Raveena Ghattaura
Officers from Bedfordshire police visited Lulu and her best friend Lila in Bedford.
They had the chance to have a go with a big toy - a real-life police car and even hand-cuff mum.
Lulu was diagnosed with neuroblastoma in 2018. It's is a rare type of cancer that develops in nerve cells and mostly affects babies and young children.
Lulu's family are fundraising to send her to New York for life saving treatment. Without it - her chance of surviving is slim.
She may just be five years old but Officer Lulu is definitely a force to be reckoned with.