What is the actual process for wasting controlled substances infusions at your nursing units?

Does the unit nurse measure out the remaining solution in both the bag and the tubing to document how much volume they are wasting?
If so how is it measured?

If it is not measured, what volume is used to document the waste?
From the infusion device or from the EHR?

Thank you for your insight.

Wondering what other organizations do to support real time wasting when it comes to tablet cutting at the ADC. Our compliance department feels the pill cutters should be single patient use, which makes sense if the enter a patient room, but when used in a clean med room I'm not so sure? Our nurses don't want to clean the cutter between uses due to risk of cut with the blade. What does your organization do?
Thank you,
Stacie Ethington MSN, RN
Medication Safety Nurse Specialist