Years ago Australian and New Zealand vegemite lovers who took supplies of their favourite spread overseas in their luggage were sometimes stopped by suspicious customs officers. Apparently the dark brown sticky substance was mistaken for hashish (cannabis extract) - although if you are familiar with both, the smell is unmistakeably different.
Customs officers now are used to homesick Antipodeans (or those who anticipate homesickness) carrying personal supplies in their luggage. But today I saw this news story.
To sum up, the US Food and Drug Administration bans Vegemite because it contains folate. Folate is actually added to breakfast cereals in the US because it prevents neural tube defects (like spina bifida) in babies, if it is present in sufficient quantities in the diet of pregnant women. You would think, therefore, that folate is a Good Thing. However, there is a list of foods permitted to have folate added, and Vegemite is not on it. In the past, a couple of jars for personal consumption were not considered a problem. Apparently this may no longer be the case.
Haven't they got more important things to look for? Like weapons and drugs? Just as well I'm not planning a trip to the US, and I'm not that keen on Vegemite that I can't do without it.