How to understood Search Cache happen in sharepoint sites?

 i have tried for many ways to create different items with different persmission with some user don't have persmission try to search result for persmission item to non persmission user accsess but result came out wrong. it will show me non authorised item to unauthorised users.

then how to check cache search in sharepoint site or how to understood particular site caching search results which is bypasses to unauthorised users

Please send any one me answer as early as possible

please anybody found any link help or hint. regarding to above question please  send me