from the link: baking anything into a cake can pose a chocking hazard and may cause the buried item to leach deleterious substances into the cake itself. Make sure your items are appropriate and always inform your guests if there is something buried in their food prior to consumption.
In this house, the kids would not eat anything if we followed this rule!!!!
A New Orleans transplant at work brought a king's cake in once for a MG day celebration, when the cake was all gone, we came up two items short of all the trinkets she put in the cake when she made it......