flagrant offender; person caught in the act
Legal term for someone caught committing a crime or immediately after. Often used in the phrase 現行犯逮捕 (arrest of a flagrant offender).
The police arrested the flagrant offender on the spot.
He was caught as a flagrant offender for shoplifting.
現行犯 is the more common abbreviation for 'flagrant offense' or 'in flagrante delicto', while 現行犯人 specifically refers to the person committing the offense.
Compound of 現行 (current, ongoing) and 犯人 (criminal, offender).