The MacBook sensors are located underneath the keyboard and trackpad, meaning that only a technician or a skilled hobbyist can find them. Apple Store technicians are said to be using them to decide whether or not damage violates AppleCare warranties, which do not cover water damage; manuals for MacBooks explicitly warn people to keep computers dry and avoid "rain, snow and fog."

A potential concern is that LSIs can sometimes be tripped through small incidents, which may cause minor damage but nevertheless invalidate a warranty. A number of third-party repair shops are allegedly forgiving of these cases, however, and will regularly choose to do warranty repair. In the case of the new MacBooks, an anonymous technician suggests that the policy should continue, unless parts have to be sent back to Apple.