The new travel regulations have already had a large impact on people who use psychiatric service dogs, Joan Esnayra, Ph.D., president and founder of PSDS, told Psychiatric News. She has been told by dog trainers that many of the estimated 5,000 people with psychiatric service dogs who wanted to travel during the last Christmas season were unable to do so because they lacked insurance and had no clinician to write the required documentation. Others balked at having to admit to airline personnel that they had a psychiatric illness. Some simply pretended that the dog was for a physical ailment and gave assurances to airline staff to that effect, which airlines are required to accept under federal law.