As of now, it is mandatory for site owners using adSense to have a privacy policy when using adsense. so here it is:

We use Google AdSense. Cookies and/or web beacons are used to collect data in the ad serving process, to show you more relevant ads. You can remove the Google Adsense cookie by clearing the private data in your browser and changing your browser privacy settings to refuse all cookies or to indicate when a cookie is being sent.

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