Proof please.
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The only proof is when you visit and see them probably make rain in a place where meteorological report has forecasted there will be no rain. Or withhold rain for days in the middle of rainy season. Road Construction Companies hire them for the job. It might sound rocket science to you but it is very simple only that they wouldn't reveal the secrete to anyone outside their circles. I guess you would be shocked to see it happen but that's not all they can do.