Bed bugs and DDT have an interesting story together. At one point it was thought that bed bugs were eradicated because of the use of DDT. This powerful pesticide was the only thing that was effective in killing them, so it was used quite liberally. Only later was it discovered that DDT was harmful to humans, and its use was banned.
Fast forward to our day, several decades later, and the bed bugs have made a comeback in a bad way, and this time there is no surefire way to get rid of them.
So, you want to be extra careful not to get an infestation in the first place. A common place to pick up bed bugs is in a hotel. With so many people traveling through and staying in the same room, there is bound to be someone with bed bugs staying there.
This is why it is important for you to take some time when you first get into your hotel room to sweep it for bugs, and not in the way a spy does. The seams of your bed and couch are favored hiding places for bed bugs, so if you pull on the seam, you should be able to get an idea of whether or not the room is a safe place for you to stay.