Its a tough thing to motivate CNA's. They are not paid well, have sometimes very heavy assignments (in so many ways, people are fat these days!), there is very little respect given to their job, etc.
3 things that I have done that are painless, and generally easy and seem to have helped is to
1. Thank you aide for whatever they have actually done. Tell them you really appreciate that they took Pt A to the bathroom
or whatever. People like to be thanked.
2. Ask the aide's advice on something. "I noticed Mr. J's appetite has really gone down. what do you think is going on?" The Aide may know that his family has not been visiting as often, or that he hates the last 3 meals with broccoli. THe Aide may not contribute anything of value, but you gave them an opportunity to share information and show them that you value their ideas. You don't have to act on any of this, but you can say "Oh thanks...I appreciate you sharing that idea with me"
3. I try as much as possible to learn a little bit about the Aide's lives at home. This way I can ask, "How is your Dad doing? How are the kids....Did you see Dancing w/the stars? I just think so and so should have been thrown off- what do you think?
But if this stuff does not produce results, YES...write their behinds up. You would not put up with a nurse doing that...why an aide?