Spanish to English Other Business/Commerce (general) newspaper article

This abbreviation appears on a police complaint from Puerto Rico under the following headings.
Examen de los Testigos
Conocimiento personal / Informacion y creencia
BJ DJ BJ DJ

There is one witness listed and BJ is checked under "conocimiento personal."

Does anyone know what this is short for?
Bajo juramento?
Durante el juicio?

Thanks in advance for any ideas.