§ 820. Unlawful practices. It shall be unlawful for any retailer:

1. to knowingly sell or offer for sale, any drug sold over-the-counter
without the need of a prescription, later than the date, if any, marked
upon the label as indicative of the date beyond which the contents
cannot be expected beyond reasonable doubt to be safe and effective;
provided, however, that when such drug is identified as an outdated drug
by segregation from regular stock or by other means, the holding of such
drug beyond its expiration date shall not be deemed a violation of this
section. When the expiration date is expressed by month and year, the
expiration date shall be the last day of the month indicated; or

2. to knowingly alter, mutilate, destroy, obliterate or remove by
means of a price sticker or otherwise the whole or any part of the
expiration date displayed on the label or packaging of any
over-the-counter drug.