Is there any place/approach where we can Hide/Disable COMMENTs and EMAIL section?

Almost all doctypes in the system have a section at the bottom for COMMENTS and a button EMAIL. is there any place/approach where we could disable/hide them everywhere (writing client script for each one of them separately will take long long time)
Your inputs are highly appreciated.

Thank you @chrislennon, if i go for client script, i should write for all doctypes, but if there is a single file or couple of files then it will be better saving time


You have to define it in the utils.js