Is there any way to physiologically dull or disable emotion in the human brain?

Either temporarily or permanently? And preferably with little to no damage to other brain or body functions. And I'm talking physiologically, not merely psychologically or meditatively disciplining away emotional responses or repressing them Vulcan style, if such a thing is even possible. I want to dull or shut them off at the source, in the brain. And not just 'bad' emotions the way antidepressants do, but all of them.

For my purposes, invasive surgical options are probably out. The more realistic the option, the better. Experimental or theoretical ideas are welcome.

And I assure you, my intentions for inquiring about this are entirely ethical and entirely legal. Someone's quality of life and functionality is being seriously impeded and I'm fishing for possible solutions.