But at least one couple has sued and authorities have launched an investigation.
"The institute firmly believes that it's always acted ethically and in good faith in all instances," lawyer Byrne Decker, who represents the Stanley Medical Research Institute, told The (Baltimore) Sun in a Friday story.
Federal law prohibits selling human bodies or organs, but fees often are paid for costs incurred by funeral homes and coroners who provide specimens.
Maine officials have cited privacy rights and state law in not identifying people whose brains were sent to the Maryland institute.