n. a person arrested for being present in a brothel or an illegal drinking or gambling establishment.
- 1958  Liquor Commission Police early today raided six alleged illegal drinking establishments and arrested 48 men and six women as keepers and found-ins.
- 1960  Found-ins from a raided Toronto gambling club are taken by paddy wagon to face charges.
- 1963  R.C.M.P. had raided the house about a week earlier [and] seized a quantity of liquor and questioned the "guests" who had been there at the time of the raid. Names of the "found-ins" were not disclosed to the court.