Jane,
You are right. They do not want to know/search because they will never admit to be wrong. In the case of gadolinium toxicity the results can be devastating. The disease is rare, a man made one and there is no cure. The internet is full of reports from people who have suffered prompt/delayed side effects to this substance, but doctors and radiographers dismiss the lot.
This is another bomb ready to explode like that medication used in the 60s which harmed people but was considered safe.
I have read of a legal case brought up in the English court from a danish radiographer, who was the first one to talk about the problem.