Magnets and Lasers, are they for treatment?

Short answer: Magnets, No.  Lasers, depends on the kind and manner used. 

First, Magnets.  There are Chiropractors that will use magnets to treat.  They claim that these magnets will keep your electromagnetic field in check and will keep you from getting a disease.  Some will claim it can even cure one!  This has been proven false time and time again.   You want to see some good articles proving it's false, go to this link:  Magnet Therapy.  When people wear these against their body and report feeling better, it is ALL placebo.  Most of the time, we will take a Doctor's word for it, and not question it.  But I could recommend a piece of plastic, or any other randomized object, as a form of treatment, and many people would report getting better.  Again, the placebo effect.

Now lasers can be different.  Cold Laser therapy is something that is widely used today in Chiropractors offices.  It is called Low Level Laser Therapy, or LLLT.  This is a legitimate form of treatment.  Basically, with a true Cold Laser, the light energy will penetrate the skin and bombard the mitochondria of cells.  These 'powerhouses' of the cells will respond to the light energy by producing more ATP.  This will be used to help heal, build tissues and 'dissolve' the pain.  This therapy is widely used by Pros in many sports.  Now, the second the Doctor starts to use it to 'cure' allergies, to change mood, 'interrupt' your electromagnetic field, or for anything besides swelling, bruising and pain, you should be leery.