Where Can I Buy Pesticide Tests (For Produce) In Thailand? (Or Is It From Foreign Companies Only)

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I am interested (for personal reasons) to test fruit and vegetables for pesticides, where can I buy this? are there sellers in Thailand?

- How does the Government test that a farm is 'in fact' organic? how can they know if they don't check food?

- so, surely there must be places where I can buy such tests.

i understand that every different fruit and vegetable may have different possible sets of Pesticides to test for, so this could be an expensive operation!

any advice on where i could start?

Also: Does anyone know where i can buy Soil Tests? (for Aluminium, Barium and other metals)

PPS: Anyone know where I can buy a Water-Fluoride test?

i know I can get this stuff from abroad (online) but its easier when I can just get it from a Thai Seller (within thailand)