Actually, some states require that store bought eggs get a chlorine bath and coating of mineral oil before they can be sold. When they receive their chemical bath, the bloom is removed which allows potential bacteria to enter the egg. It also allows for moisture and carbon dioxide loss, which results in a runny albumen (ever wonder why store eggs whites are inferior to your backyard eggs?)so, they give a coating of mineral oil (or veg oil) to help with this. The USDA requires eggs to be processed within 30 days of when it was laid, 7 for higher quality eggs (organic). Even the organic eggs are required to have this chemical bath. Some commercial producers even wash their eggs in Lye.
Did you know that chlorine reacts with organic materials to form highly toxic chemicals called DBPs (Disinfection Byproducts
http://www.google.com/url?sa=t&sour...z4DIDA&usg=AFQjCNFWKJ30MiIUJol93Z9d8uR0MilT7A ), which can be carcinogenic and mutagenic? Eggs are an organic material, so who knows what kind of chemical reactions are going on inside an egg washed in chlorine....
Every state has its own laws regarding how eggs are handled, so its difficult to figure out exactly what's being done to your eggs before you get them. There are federal laws that must be followed as well.
Here's something else: According to the USDA publication "Guidance for Shell Egg Cleansers and Sanitizers"[iv]
"Compounds used to wash and destain shell eggs are potential food additives. Therefore, they are regulated by the Food and Drug Administration (FDA). Unfortunately, FDA does not have any published regulations dealing with shell egg cleaning and destaining compounds."
...
The publication goes on to give some guidelines for egg cleaning chemicals, basically instructing farmers to use substances that are "GRAS" (Generally Recognized as Safe), but these substances are not limited in any way.
http://www.fsis.usda.gov/FACTSheets/Focus_On_Shell_Eggs/index.asp#20
This link is from the USDA website, stating that you shouldn't wash your store bought eggs because the water can be "sucked" into the eggshell, and that its not necessary for the consumer to do so because they've already been "washed and sanitized" before going to the store. I couldn't get the link for the USDA publication to work (Guidance for Shell Egg Sanitizers and Cleansers EDIT:
http://www.google.com/url?sa=t&sour...hoGQCA&usg=AFQjCNFZAjuwCGh9SvCIwf40rt5w_rw_AQ got the link to work-I think ), which is why I quoted it directly.
So, in my opinion, your backyard eggs are better. They're fresher, contain more nutrients because your birds have access to grass and dirt (this is an assumption on my part, but hey- you're on BYC) and they offer peace of mind that the animals that produced them were treated humanely. Your son certainly isn't the reason government is so involved with our food. We, as a nation, helped them with that when it became acceptable to buy everything with convenience in mind. Just my $0.02.
Nikki