In recent years, clandestine photo-taking has become a serious problem, with 285 reported cases in 2017 and 313 in 2016. One of the most rampant forms of clandestine photo-taking is upskirting, which involves taking photos or videos of a person from beneath their clothing without their consent. In the past three years, there have been 327 reported cases of upskirting in MTR areas alone, with an average of 100 cases annually. However, this is just the tip of the iceberg, as the number only includes incidents that took place in railway areas.