The security guards that have been hired to work in Ellen’s studio are rigorously trained to be able to identify hidden weapons as well. Even if it is for general self-defense, trying to sneak a weapon into the studio will get you kicked out at least. If you try and sneak a serious weapon in, you will undoubtedly get arrested.
Have Phone, Can’t Use It
The only recording device you can bring in with you is your cellphone. You are allowed to have your phone with you in the studio, but it needs to be powered off and in your pocket at all times.