I want a simple, robust way to identify retweets in a hashtag search using twitter api 1.1.
For example, if I send the following request with the proper authentication:
sounds rather like you've answered your own question.
retweeted_status is present when the retweeter has used Twitter's official Retweet function.
However people still to the old style
RT: <quote> approach which won't give you any solid data bindings in the data returned from the API. The only way to handle these is to compare the text and see if the original text is contained. If they've modified the text then you're stuck, but then if they've modified the text then technically it's not a Retweet - it's just plagiarism ;)