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There are actually driveway gates that can be installed. Adding features such as selective access entry by means of a password oriented system, cameras, motion sensors and remote access can also be a part of the gate. The next level of defense comprises of security doors. There is a variety of materials used to make these doors more intruder resistant. It could be made of steel, wood or a combination of the two. The good thing is that the designs they have are not limited.
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Likewise, your objectivity and non ranting presentation is appreciated and valued.
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In the science fiction movie "Gattaca," Ethan Hawke's character was able to get into a secure area using nothing but a scan of his retina.