Under Current,
First and most importantly, there were dozens of countries that recieved biological cultures that Iraq recieved, on a routine basis. The USA did not have sanctions against Iraq in the 1980s or against the dozens of other countries that such biological material went to. Many life saving biological or radiological material or equipment often goes to other countries and, yes there are duel uses for this material. Hardware store does not stop selling supplies simply because what it sells can be used to build a conventional bomb.
I think you fail to fundamentally understand the difficulty in using chemical and bio weapons on the battlefield do to its dependence on variable conditions for it to have successful effects. In addition, Biological weapons take days and perhaps weeks to take a full effect. Their best use is as a terror weapon against a defensely and stationary, unsuspecting, civilian population in a city. Killing Iranian civilians in cities is not the objective of Saddam or his Army. The Objective was to be able to stop and defeat the Iranian military. The best and virtually only way to do that is with a strong conventionally well equiped military. Chemical and Bio weapons, as I said before are effective terror weapons against a stationary, defenseless civilian population, not a mobile protected military. Nuclear weapons of course are a different case. So, keeping this in mind, even if the USA desired to materially help the Iraqi military, it would do so by supplying conventional military weapons, not Biological cultures that have duel uses and have not been weaponized and been matched with equipment for effective means of distrubution against the intended target, and even if successfully distributed over a given area, will take days to take effect and may not hit the intended target. There were far better ways for the USA to effect the battlefield situation between Iran and Iraq. In addition, Iraq new these facts and while they may have experimented with the Biological material, they have never launched a biological attack against anyone or anything. Iraq already had Chemical weapons prior to the Iran/Iraq war.
Again, Biological material that Iraq recieved from the USA have never been used against any country. The USA of course knows the duel use of such equipment, but did not ban it at the time because of its important scientific and medical uses. Dozens of countries recieved the exact same material in the way that Iraq recieved it. Unless there was a specific sanction against the country, they could recieve this material. Remember this is Iraq in the mid 1980s, its easy to look back now and see how ruthless Saddam and his regime is, but in the mid 1980s, Saddam had commited only one international infraction by invading Iran.
Iraq also recieved all kinds of similar material from several other western countries, in addition to recieving supplies along these lines from the Soviet Union, the largest manufacturer of Chemical and Bio weapons in the history of the planet. In addition the Soviet Union built, equiped and trained the Iraqi army through out the 1980s. Nearly 75% of Iraq's military equipment and vehicles and aircraft came from the Soviet Union. In addition, the Soviet Union kept 2,000 Soviet troops on the ground in Iraq throughout the 1980s and up to two months before the 1991 Gulf War.
Bottom line is that Iraq recieved Biological material from the USA for scientific medical purposes just like dozens of other countries did at the time. Only specific sanctions against Iraq at the time could have prevented these duel use techonologies from going to Iraq. Even if such sanctions were in place, Iraq could have and did recieve similar material from as many as a dozen countries in addition to the Soviet Union which was supplying Iraq with nearly everything they wanted. Finally, Iraq never used Biological weapons against Iran for the obvious reasons, which completely refutes this notion that the material intentionally went to Iraq to somehow aid it militarily or in some other way in its war with Iran.
Rumsfeld does not work for the commerce department and does not know how many countries are recieving which kind of possible duel use material, at that time back in the 1980s. Rumsfeld trip to Iraq was simply verbal and diplomatic support for the regime in its war with Iran. The Soviet Union was already supplying and did supply Iraq, with everything it needed to finally defeat Iran on the battlefield in 1988.