Morse Code

"Hello, I'm here for the daily check-up." 

Holding a clipboard to her chest, a nurse approached the officers stationed along the hallway with a nervous smile. Spotting her, a policewoman stepped forward and stated in a friendly yet firm tone. "Hello, please take out everything in your pockets and put your arms up. Don't worry, this is just a protocol." 

The nurse hurriedly nodded and carried out the instructions. After the body check, it was determined that the nurse was clear, and only then did the policewoman give a signal to her colleagues. 

"You may enter. Thank you for your cooperation…" she glanced at the nametag on the nurse's chest. "Nurse Yu."