Electronic article surveillance (EAS) are magnetic or radio-frequency tags that sound an alarm if a shoplifter leaves a store with store items that have not been paid for. EAS methods are second only to CCTV in popularity amongst retailers looking for inventory protection. EAS refers to the electronic security tags that are attached to merchandise and cause an alarm to sound on exiting the store. Some stores also have detection systems at the entrance to the bathrooms that sound an alarm if someone tries to take unpaid merchandise with them into the bathroom. Regularly, even when an alarm does sound, a shoplifter walks out casually and is not confronted if no guards are present because of the high number of false alarms, especially in malls, due to "tag pollution" whereby non-deactivated tags from other stores set off the alarm. This can be overcome with newer systems and a properly trained staff. Some new systems either do not alarm from "tag pollution" or they produce a specific alarm when a customer enters the store with a non-deactivated tag so that store personnel can remove or deactivate it so it does not produce a false alarm when exiting the store. However, spider wrap may be used instead of tags.