This sounds excellent, but when you translate that into the number of inaccurate characters you can expect, it works out to roughly 30 typographical errors on each typewritten page. If the 30 typos are randomly distributed, that means 30 words on the page are misspelled. But for litigation purposes, when the accurate retrieval depends on a computer searching for and matching words, this error rate is unacceptable. Therefore, OCR conversion of litigation files requires significant editing and clean-up by an OCR technician. You tell the computer exactly what words or names you are interested in, and the computer pulls up the documents that contain those terms.
Computers are very literal.
Unless you have highly sophisticated word-searching software, the computer will only find documents with words that exactly match the terms you entered. Electronic deposition transcripts from top-notch court reporters come close to this ideal. But the real world of litigation seldom presents you with perfectly clean document collections. These seemingly minor vocabulary problems can lead to catastrophic results in the heat of trial preparation. The attorneys had the advantage of being familiar with the document retrieval system and with the document collection.