Lateral Reading is a practice that validates information by comparing and fact checking content between sources --hence you are reading laterally. Some lateral reading practices.
Other evaluation techniques that may not apply in every instance.
Once you have a critical mass of evidence, try to align the different kinds of documents together Do the journal articles and policy papers line up with the news sources? If they don't, then you have a hole in your research and you must look for other sources to bridge that gap.