From MedCityNews:
The practice is seen by medical residents as a time-saver but the attendings consider it an “egregious problem” because the practice has the potential to perpetuate mistakes. For example, someone might copy and paste information from a patient’s medical history without verifying that the information is correct. Any errors that might exist will be repeated.
EMR can’t just disable the copy-and-paste function, since such a move would impact other programs.
References:
Medical Malpractice Liability in the Age of Electronic Health Records - NEJM, 2010 http://goo.gl/cGZG9