The eas system alarms of supermarket security doors everytime when the old lady cross it

Search in recent years, beating the incident occurred in the supermarket security, the majority of "degaussing" the, what causes this phenomenon is it? 

The eas system alarms of supermarket security doors  everytime when the old lady cross it
    Tesco supermarkets, public relations director of Miss Ren introduction, demagnetization is invisible supermarket mall security doors and security measures for major supermarkets. General supermarkets using the "strip" and "Cikou" security label of two supermarkets, "Magnetic" is the one time, usually installed very hidden under a degaussing board checkout, payment can be carried out when the degaussing. "Cikou" is permanent, can be recycled, usually packed in clothes, shoes and other valuables, the customer payment, the cashier will use special tools to remove. As Cikou Clearly, one can see it, so not a big issue, the main disputes is magnetic, if the cashier forgot to degaussing, or degaussing is not complete, would give rise to the supermarket burglar alarm rang.
    Miss Ren said, in fact, anti-theft tag is to "prevent a gentleman or not people", the real thief will try every means to avoid regulation. In Tesco's Security Department in the reporter saw a penalty book: in June this year, a lady will be a 79 per dress Cikou removed, wear on the body and went exports, was the security marshals arrested.
    An old woman, walked every supermarket security doors, alarms should be called
    Once the alarm ring, is a theft suspect, this is the view of many consumers, disputes are arising. Tesco supermarket about something interesting for a security, a girl before two days after the checkpoint, the alarm rang, and later found her wallet to buy elsewhere there are bars, and security help degaussing, many people Wai came over, depriving the girls waved and yelled, "see what see, I am not a thief."
    Several supermarket security were introduced, there is a lot of goods, especially foreign trade clothing often incorporating a magnetic stripe, some other off strip after degaussing of magnetic period of time will automatically resume when the customer through the checkpoint, the alarm will cause device sound, similar to what the supermarket has repeatedly encountered before. "Customers had to buy clothes elsewhere with magnetic stripe collar office, we discovered to help him removed, the customer was quite grateful." Miss Ren said.
    In addition, with some people who have strange magnetic, Tesco and a security briefing, he was a supermarket in Hangzhou Qingchun Road work, has encountered a bit too old lady every supermarket security door alarm will ring, but find no reason.