So the police want the hospital to do their "dirty work"?
Is the guy free to refuse treatment if the hospital wants to give him a laxative, or whatever they do for someone who hasn't pooped in 46 days?
It isn't clear to me if the reason the guy hasn't pooped is because he's been starving himself, or just gone on a liquid diet and refusing to eat solid food. Not having pooped in 46 days might be a health issue depending on why that is, but starving or nearly starving oneself would be. If the hospital gives him IV nutrition, and he refuses solid food or laxatives, what then? Get him healthy and then back to jail?