Systems and methods for gathering research data using multiple monitoring devices are provided. The systems and methods include a processor to generate message data by supplementing first information collected by a first monitoring device with second information collected by a second monitoring device, the first information and the second information collected from media presented by a monitored device, and process the message data to determine a portion of the media that is encoded and a portion of the media that is unencoded. The example systems and methods also include a memory to store an indication that the message data is valid when the message data represents a code encoded in the media, and store data indicating the portion of the media that is encoded.