practice your verbage so that you state only things that can be varifiable through your licensing certification. Remember when using scientific information that nothing is the truth or absolute, try the line “the science suggests….” Dont be afraid to say you dont know but explain that you can find in out and how someone could get if from you for later.
I do a great deal of public speaking if you need more help just let me know. Remember that a TV station will not partner with someone they dont recognize as a professional, so be confident.
hope it helps