It's inconsistent. I've had various things denied in carry-on (e.g. jar of jam, snow globe, etc). A TSA agent even told me that snow globes were not allowed eve

It's inconsistent. I've had various things denied in carry-on (e.g. jar of jam, snow globe, etc). A TSA agent even told me that snow globes were not allowed even in checked luggage, which I found out later is false. I had to find some way to mail the snow globe to myself from the airport.