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Do not disregard a female or even someone who looks to be retirement age. Operatives can be any sex, any age, with the exception of children although children can be used as props as can pets.
The surveillant can use many disguises, many props, many techniques. Once again, it's their imagination against yours. Be alert, look for the same person sitting nearby in a vehicle. Look for the same person walking on the sidewalk or the mall or outside your office.
If the hair on the back of your neck stands up, pay attention to it. I'd like to depart for just a moment at this point to discuss the surveillant who is not an operative who is "on the job." I'd like to discuss the possibility that you may have a stalker. My intent, once again, is not to frighten you, but to help educate you, give you options and in this case help you stay safe.
The Do It Yourself Detective
If you have noticed someone paying attention to you, first make sure that your home is secure. Lock all windows and keep them locked. Do not sleep with windows open, no matter what floor you sleep on.
Put keyed deadbolt locks on all doors and do not leave the key in the lock when you are home, but put it on a nail for the key next to the door, out of reach of a window, but where you can get it if you need to leave in a hurry. Always look around carefully when you leave home or office and try to go with other people when you can.
Keep car doors locked when driving. When walking to your car have your key in your hand ready to use and as you approach your vehicle look underneath to make sure no one is hiding there. Check the interior of the vehicle before you get in as well. It is not impossible for someone to gain access to your vehicle.
It's always a very good idea to carry a portable cell phone on your person with a fully charged battery to call for assistance should the need arise. Cell phones are also very helpful at home should phone service not be available.
The rules are the same for you whether you are at home, the office, the mall or at a friends house. Be observant, be aware of your surroundings and pay attention to people who may be paying attention to you.