charting medication administration

I just recently started a new job at a surgery center and one of the nurses training me in endoscopy charts her conscious sedation medication in a running total instead of charting the medication dose individually with the correct time given. Instead, the next dose of versed she gives, she'll tally up from the last dose given. I don't feel comfortable charting this way but she said if it was wrong, then the accrediting agency would have caught it. She also said she did this at the hospital she used to work at. I feel it's not safe practice. Is this an acceptable practice?