Can I retrieve my activation and deactivation history? I turned off my find my iphone in my settings about a year ago. My friend said that he swore it was on a couple of months ago and I swore that it wasn't because I just turned it back on today. Is there a way to check a history of that? We tried the email search but my email wasn't much help. Is there anything I can do to prove that its been off this whole time?
No, no actual history or log of either activation of deactivation exists. 

Apple, though, sends to your iCloud account an email whenever your device gets the Find My Phone feature deactivated.