Larry,
I have a few suggestions.
1 - Add a procedure for how to deal with this in your policy and procedure manual. Therefore, on the witness stand you can stand that the mistake was corrected in conformance with your agency procedures.
2 - Never use PhotoShop to delete (except routine cropping) or add anything in a photograph. In addition to affected your credibility, it would most likely render the photograph inadmissible and could be argued to constitute fabrication of evidence.
3 - If your lab is ASCLD-Lab accredited, the correct procedure is to draw 1 line through the error so it is still readable. Initial the strikeout. In ink, write in the correct case number, date and initial it. Document this in your notes.
Bob Sanders
Forensic Imaging Unit Leader
Wisconsin State Crime Laboratory - Wausau
Sorry, no new suggestions.
Re-photograph if practical and document the error either way. Why bother going the Photoshop route? A new photo & a couple of lines in a report is faster, easier, & more ethical.
Rob Young