We recently had a need to determine if a document was OCR’d within a workflow process.  With some help from Brett Hickinbotham, Sales Engineer at Laserfiche, we discovered that it is possible to use the ‘Retrieve Document Text’ activity to generate a token with the text of a document.  If the document has no text, the token will be blank.  In our particular case we used this to tag the document as “Needs OCR Applied” so that we could leverage Quick Fields to perform the OCR process on the document at a scheduled interval.