Hi Tony. I'm not sure what you mean by "contract packing". I buy these products in bulk and then repackage them. I have a fairly in-depth knowledge of hemp seed foods. As far as I know, there are no hazards associated with them. There are no known allergens to hemp seed foods and, while many people confuse hemp seed foods with marijuana (I find tons of references to "hemp oil" when they are really referencing "marijuana oil"). BTW, hemp seed oil has a healthier profile than olive oil. The two plants are very different in look, differ in farming methods (if grown together, they will cross-pollinate and render both useless for their intended purpose), etc. Hemp is the most Earth-conscious plant (even more than the much-touted bamboo), needs to pesticides, insecticides, herbicides to grow. It has been used for food, clothing, etc., since (as far as we know) 10,000 BC. It is still used in most of the rest of the world. In fact, today, BMW, Audi and Mercedes-Benz have 10% hemp fiber in the car (mostly in panels). The story of hemp in the US is quite interesting and has to do with the Mellon Bank, DuPont and the predecessor to the DEA.
Having said all that it is important to select the right provider of hemp seed foods. Like everything else, producers can cut corners and offer a product that is adulterated (just like with olive oil producers which are known to adulterate their product with other vegetable oils that are less expensive), or that is produced in less than optimum conditions (e.g., cold processing of the hemp seeds to produce hemp seed oil at temperatures lower than 50C in an oxygen-free environment; oxygen-free environment and packaging to prevent early oxidation of the oil; facility dedicated to hemp seeds to prevent cross-contamination with known allergens such as peanuts; etc.).
Happy to answer any questions/concerns you may have. You may also learn more on my website. Over the next few days, I will be putting up a tab titled "Hemp College" (or maybe "Hemp University", not sure yet) which will contain a variety of articles (mostly medical/scientific) on the benefits of hemp seeds as food, as well as history of hemp. BTW, in the US, a farmer had to grow hemp or could go to jail (it was the law); hemp could be used to pay taxes; the drafts of the Declaration of Independence, most of the books (including the Bible) and currency were written/printed on hemp paper (much friendlier product to the environment than paper produced from pulp wood); Washington and Jefferson were hemp farmers and Ben Franklin owned and operated a hemp mill. While regulations on hemp made it prohibitive to grow, along with cheaper competition from DuPont fabrics, in 1942 the US government spent $10MM to encourage farmers to grow hemp as part of the war effort. The government even made a movie (link on my website or you can search for it on YouTube - "Hemp for Victory") about it.
Today, states are liberalizing the culture of hemp (along with marijuana) which runs afoul of federal laws. However, the culture is not illegal as much as it controlled. That is, one can apply to the DEA for a permit to grow hemp. It requires 8 ft. fences; locked gates; lighting of the entire acreage at night; and 24/7 guards. Hawaii was the last entity to apply for a permit in 1999. It was granted but the experiment was ended some 6 months later. It is legal to import and consume hemp products, include hemp seed foods.