Under special instructions:
Do not include:
Anything that contains electronic chips and batteries (such as musical greeting cards) or any non-paper materials such as CD-ROMS, DVDs, toys, action figures, or thumb drives. We will not accept these types of materials. However, we will accept photographs or copies of these items.
Any biological or genetic samples as DNA evidence. For information on DNA testing and submitting DNA samples, please visit the Department of State’s page.
Graphic photos of childbirth or intimate relations as evidence of a relationship or marriage.
https://www.uscis.gov/i-130