How do I know if my site is blacklisted by AdSense

A friend told me that my site seems to be on the Adsense blacklist, that’s why I can’t get Adsense approval and can’t run Adsense ads on my site. I try to submit, Adsense review rejects feedback, all I get is generic policy and machine feedback.

  • I don’t know if there is invalid traffic
  • I’ve been through everything and it seems to be the same as any other site I own and have approved

Is there any other way to get more feedback on a specific issue, or to determine if my site is blacklisted? Since I originally purchased this site, I’m also curious to know when my site has been blacklisted for obvious reasons.