Bang to rights
Definition 1 of 1
Pro Tip 1/3British Origin
The phrase is specifically British and used in UK contexts, not commonly understood by American English speakers. 
She was caught bang to rights over the missing money, mate.
Pro Tip 2/3Unmistakable Guilt
Use the phrase to express that someone’s wrongdoing is clear and uncontested, akin to being caught in the act. 
They had the evidence – he was bang to rights.
Pro Tip 3/3Colloquial Usage
It’s informal slang, suitable for casual conversations but not for formal writing or speeches. 
Did you hear? Joe was bang to rights for skipping class.