this detail in the book. When asked during an online question session, "What child did Harry give the Marauder's Map to, if any?" (after his school years), J. K. Rowling responded, "I've got a feeling he didn't give it to any of them, but that James (Harry's eldest son) sneaked it out of his father's desk one day." However, in Cursed Child, Harry is shown to still possess the Marauder's Map and gives it to Professor McGonagall to keep an eye on his wayward son Albus Potter. Probity Probe A Probity Probe detects spells of concealment and hidden magical objects. The detector made its first appearance in Order of the Phoenix at the Ministry of Magic as a thin golden rod. After Voldemort's return, Probes are used as part of the increased security at Gringotts Bank as well as for scanning the students of Hogwarts for Dark objects. They are last seen when Harry, Ron, and Hermione arrive at Gringotts in Deathly Hallows to rob Bellatrix Lestrange's vault of one of Voldemort's Horcruxes. Remembrall A Remembrall is a small, clear orb, about the size of a large marble, containing smoke that turns red when it detects that the person holding it has forgotten something. It does not tell the holder what has been forgotten. The forgetful Neville Longbottom is sent a Remembrall by his grandmother in Philosopher's Stone. Remembralls are forbidden from being used during the O.W.L. exams. Revealer A Revealer is a bright red eraser, used to make invisible ink appear. It made its first appearance in Chamber of Secrets when Hermione tried to make hidden writing appear in Tom Riddle's diary. Secrecy Sensor The Secrecy Sensor is a dark detector described as "an object that looked something like an extra-squiggly, golden television aerial." It vibrates when it detects concealment and lies. In Harry Potter and the Goblet of Fire, Barty Crouch Jr disguised as Alastor Moody mentions that it is "no use here, of course, too much interference – students in every direction lying about why they haven’t done their homework." In Order of the Phoenix, Secrecy Sensors are used at the Atrium Desk in the Ministry of Magic upon visitors to the government locale. Later in the book, Harry mentions to Dumbledore's Army that they can be easily fooled like their other dark-detecting counterparts. In Half-Blood Prince, due to Hogwarts' new stringent security measures, Argus Filch is