People in any occupation can be corrupted by greed and fear.
If we are talking about corruption in medicine and healing- yes, people in the pharma industry can be corrupt and greedy; so can faith healers!
In any case, no one with sense thinks that science determines morality. (Though ironically this whole thread is based on an article about a scientific study, published in 'Nature'.) Many people think that science offers a better explanation for the existence and nature of the world than religion does. But that doesn't mean that they think it determines morality.
'If they think there's no god, then there's no fear of divine retribution either. So, anything goes.'
That's the most amazing leap.
People who think there's no god still have to fear:
The pangs of their own conscience if they harm others
Being disliked and disrespected by others, whose good opinion they value
Public humiliation, loss of status, loss of job. (For instance, a scientist who is found to have falsified data may find that they are unable ever again to get research funding, and their career may end in disgrace.)
In serious cases, criminal sanctions and imprisonment.
Do these always act as deterrents? No. But the prospect of divine punishment certainly doesn't seem to do so either!