I had given three ad unit codes to one of my Ex-friend. To put it in his site and now for a while (a month) his site is down and not found. Now i just need to block that ad units from using any where in the internet. Is there any option to do that from my adsense panel ? Because, i concern about my adsense account security. since i m not able to contact him(he is not picking my call). thanking for any time of help....BHW members are always rocking.....!!!