I live in Australia. One of the country's most revered radio stations hosts one of the country's most revered scientists in a fun QnA session known as the 'Science Hour'. Listeners phone in with their weird and interesting questions and Dr. Karl answers them live.
Now, on the most recent episode - 2017-11-02 (33:00) - Dr. Karl is asked by Stephanie from Newcastle:
What is it about the human brain and the attraction to firearms?
To which he replies:
...because of lobbying for the last two decades in America, by the National Rifle Association, the CDC - Centre for Disease Control - ... have been specifically forbidden, by Congress, to carry out the various sorts of studies to let us know what is so attractive about guns.
[snipped for brevity]
As an Australian, I don't really understand the Congress system of the US or anything along these lines, but this has struck me as odd and pertinent, given the situation.
I'd like to understand and verify is it true that the US Congress has specifically blocked the CDC from studying the brain's attraction to firearms?
Given the political nature of this topic, please limit all answers or discussions to the question at hand