Catch somebody red-handed
Definition 1 of 1
Pro Tip 1/3Visual Evidence
The phrase often implies that the wrongdoing is witnessed visually, almost as if caught on camera. 
He was caught red-handed on the security footage.
Pro Tip 2/3Immediate Confrontation
Using the phrase suggests someone is confronted at the very moment of committing the wrongdoing. 
She caught them red-handed tampering with her documents.
Pro Tip 3/3Implies Guilt
It implies the person has no excuse or denial for their actions because they were clearly in the wrong. 
He admitted his guilt after being caught red-handed stealing the car.
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