Are there any ways to pass through a laser sensor without being detected?

Are there any ways to pass through a laser sensor without being detected?

 

 As the question asked about "passing through" a laser sensor, the answer speaks to the breaking of the laser beam. And that's not something that you can do. Breaking the beam will trigger the sensor. If an investigator has an idea about the laser itself, it may be possible to "substitute" for the beam being used in the sensor, but most laser sensors will pick up any attempts to dump another beam in over the top of the extant one. Forget about mirrors and such. The "smart" laser sensors use a beam too small to "split" with mirrors. Rerouting with fiber optics is equally futile. What you've seen on those TV shows and in movies is pie in the sky - you can't do that. About all you can do is detect the beam and avoid it.

It might be worth noting that anyone using a laser may also be using infrared IR sensors. (I would.) These sensors are not lasers and are completely passive; they emit nothing at all and cannot be "seen" in any way. (See the link below "What is a PIR alarm system?" for more details). If something is worth protecting with a laser, an IR detector would be an easy "add on" to that system. In fact, given a choice, the IR would be a better first choice.