If you don't see the police vehicle through the peephole, call to find out. Don't advertise that you are home alone. Keep a light on in more than one room to make it appear that you may not be alone. Remember, most rapists and burglars are opportunists. Never keep extra keys hidden outside your home.
Perpetrators know all the best spots.
Give extra keys to a trusted neighbor and always notify them if you have someone that will need the key in advance. Contact your local police department or sheriffs office. Most departments will happily give you a free home security survey. IN YOUR CAR Park in well lit areas. Always lock your car, whether you are inside or the car is parked.