I've never seen anyone try to take duct tape away from someone at PHL. Not saying it hasn't happened, I've just never witnessed it at the checkpoint I work at. It's funny you mention spray starch. On Sunday, I had a woman travelling to Disney with her kids pull a small can of spray starch out of her bag and ask me if it was okay to take with her. Someone told her that you weren't allowed to take any aerosol sprays on the plane. I let her know that small amounts of aerosols like deodorant are okay and I looked at the size of the can and seeing it was only 3oz, I told her she's ok and to enjoy her vacation.