That is a good point. In the same way of thinking, just downloading random images from Google images should not be secure enough, as they may also be AI-generated images or just wrong images.
In this case, I would advise manually searching for images and only getting them from trusted sources after comparing images with different sources (as everybody may make mistakes, and taking a second and third opinion should be advised).
If you manually search for suitable images, creating cards should take a significant effort/time (I was doing so before using AI images). Perhaps buying medical school decks from a trusted/good-rated source would be more efficient than creating them yourself, as medical requires a greater degree of trustfulness.
Another option would be to generate all your cards with Artificial Intelligence and later review each image by looking at trusted sources to check that your photos are accurate. I searched for AI images, and maybe this article will be interesting for you:
To mark my generated cards for review, I would create a field in my card named IsThisReviewed and add this to my card front template:
{{#IsThisReviewed}}
My card question template...
{{/IsThisReviewed}}
This way, anki will show all cards that do not have an ok in my IsThisReviewed field as empty cards. This way, when studying new cards, I know which cards must be reviewed, and after reviewing them, I would put an ok on the IsThisReviewed field, making the card appear instead of being marked as an empty card by anki.
On a day I do not want to review any cards, I have added an option to my addon to bury empty cards automatically: Source Siblings Bury Cousins addon (support thread)