Confusing creamy layer

Yesterday Supreme Court Judgment cleared the path for 27% seat reservation for OBCs in central institutions. I believe at state level, mostly this reservation is already in place. I only got confused with the term associated with the judgment "creamy layer". First of all what will be the criteria to find out whether someone will come under the creamy layer or not and secondly who will decide that criteria and implement it. I am sure once the criteria will be decided (in future) a new practice will get started to exploit the loopholes where an able guardian (who should come under creamy layer because of wealth and property owned) will start (legally) declaring that they have dissociated themselves with their son/daughters. I wont be surprised to see grandchildren of Mr. Laloo Yadav applying for reservation with an affidavit attached that his/her parents doesn’t inherit any property from Mr. Yadav and so they don’t come under creamy layer. In India although the law is well settled but there is enough lacuna to exploit it.