Although opiates are wonderful for pain relief, I think that it's sad how often people become addicted. And truly, who can blame them from wanting to escape from the pain? Have you tried gently talking to the patients that are messing with their lines? Confrontation does not always have to be a negative thing. I've seen people that have had someone gently call them on their behavior have a light-bulb moment--"Gee, I guess I'm not fooling anyone, after all."
Many times, I've been told by my patients (alcohol/drug addicts) that they wish I was their nurse all the time. Why? Because I treat them with kindness, despite their lashing out. I'm also not afraid to use therapeutic touch--too often, society treats people addicted to substances as modern-day lepers. One of my favorite things to do is to tuck them in like you would a small child. Find out their favorite type of juice and how they like it served (no ice, lots of ice, with a straw.) It's truly amazing the response that you might get for these type of small efforts to be kind. I know that in our increasingly high patient-loads, it can be hard to do this, but it pays off for the long-term, as you have a happier, less-grumpy and demanding patient. Give it a shot...you might be surprised.