Doesn't appear to be a date on the memo, which is unusual, memos usually have dates, and everyone seems to know it's from April 1995... but which exact date.
Freeper mfulstone on another thread, mentions that the OKC bombing happened on April 19, 1995 and wonders if this "separation" or "wall" might have been erected to keep the OKC investigation from being broadened (if, indeed, it post-dates April 19, 1995).
His exact words are: "The Gorelick rules were meant to ensure that "no 'proactive' investigative efforts or technical coverages" of terrorist suspects be carried out on U.S. soil."
Where is the date on the memo?