Please tell that to Sheena Greitens, Assistant Professor and author of book
"https://books.google.com.sg/books?id=GR-nDAAAQBAJ&printsec=frontcover&dq=Sheena+Greitens&hl=en&sa=X&ved=0ahUKEwjk6pz0hJnPAhVMSCYKHaRCAaUQ6AEIGjAA#v=onepage&q=Sheena%20Greitens&f=false"
According to her Singapore has no Secret Police