The bill looks at exempting from prosecution somebody who calls 911 or calls for help, if they are in possession of drugs. As you pointed out, you broaden the scope. Just by saying “broaden the scope”, you're going beyond the scope of what was adopted at second reading, which was to limit the scope to that possession. If you go over by adding trafficking, or other suggestions that you made, you are broadening the scope, and therefore going over what was adopted by the House at second reading. That's the reason.
On September 20th, 2016. See this statement in context.