I used to worry about the bone meal transmitting BSE (mad cow disease) as there was some talk of it at the time of the scare in Britain. I still have a bag of it in the shed unused; and though part of me is convinced, it is hard to get it out and start fogging it around. Maybe this year I will use it. I have a link here, for those of you who care to go further, that was interesting and pretty comforting. But, you know, just in the interest of complete transparency.
http://www.organicconsumers.or...
One other thing, I have used bone meal in the past and had quite a bit of problem with the critters (skunks I think) digging into the soil looking for what they think smells like food. Of course they tear up all my newly planted purchases and sometimes my seedlings too. Eventually I just took to using manufactured fertilize. I purchase what we always referred to as potato fertilize when I was growing up. It is sometimes available at the farm stores early in the spring and the nutrient scale is 6-24-24. Works great for me.