All businesses have occasion to discard confidential data. Customers lists, price lists, sales statistics, drafts of bids and correspondence, and even memos, contain information about business activity which would interest any competitor. Every business is also entrusted with information that must be kept private. Employees and customers have the legal right to have this data protected.
Without the proper safeguards, information ends up in the dumpster where it is readily, and legally, available to anybody. The trash is considered by business espionage professionals as the single most available source of competitive and private information from the average business. Any establishment that discards private and proprietary data without the benefit of destruction, exposes itself to the risk of criminal and civil prosecution, as well as the costly loss of business.

~ taken from "The Risk Management Series", published by the NAID (National Association for Information Destruction).