Studies abbreviations used in text message to identify the author: forensic linguist
forensic animator
forensic videographer
forensic artist

forensic linguist

Explanation:

From the available options provided the only individual position that does this would be a forensic linguist. The responsibilities of this position include analyzing language on text or recorded documents. They do this in order to understand and uncover different details within the document that may help law enforcement solve a crime. This also involves studying abbreviations used in text messages to identify the author, what the abbreviation means, in what context it is being used, hidden meanings, etc. All of which can be highly valuable in a criminal case.