I am looking to buy a domain name and the previous owner said he was running adsense on it a long time ago. Is there any way I can find out if the domain itself is banned from using adsense again?
if i were you I would go to the source and contact adsense. tell them you are buying a site from another owner and want to confirm the site has not been banned from using adsense and if it has what can be done to un-ban it now that it has a new owner.
Yep, contact AdSense first to make sure. I remember reading posts where people were banned for putting AdSense on sites they just bought that were previously owned by people who got banned.