shoulda just dropped all of it into your milk shake, woulda been near impossible for them to find anything. Of course hindsight is always 20/20. In the future assert your rights. Parking in an area DESIGNED for parking cars is not probable cause, even if it happens to be notorious. Interstate 5 in California is notorious for having cars carrying drugs travel down it, does that give police probable cause to search any of the vehicles it wishes? Parking a vehicle in a Parking lot ina bad part of town is not illegal, there is no probable cause.
Perhaps learn the 4th Amendment:
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
Next time tell them you were there to masturbate.