These government and agency websites offer forensic science information with graphics that could be useful for your presentation.
Government websites will not offer APA citations, like library databases do.
FBI
Selected FBI pages are below.
These library databases offer professionally produced streaming videos, with citations.
Try a Google Advanced Search to fill in gaps in your research. Reach it by doing a search > click gear symbol > click Advanced Search.
These privacy search engines will not track your searches.
If its not yours, it's someone else's. Give them credit.
Visit the CRW for advice on paraphrasing and citations.