In a number of cases, it has been shown that bans on mobile use while driving have proven to be an effective way to deter people from picking up their phones. Those violating the ban usually face fines and points on their licence. Although an initial decrease/alteration in driving habits is to be expected. As time goes on the number of people breaking these laws/regulations eventually goes back to normal, sometimes higher levels as time goes on and people go back to their old habits. In addition, police officers have difficulties detecting mobile phone use in vehicles, which decreases the effectiveness of bans/restrictions on mobile phones.