Can you have a laser lipo on stomach if you have a titanium plate in spine?

The laser light is directed out from the end of the glass fiber tip and travels a millimeter or so before it is defocused and the light energy is then converted to heat energy. This is how the tissues are stimulated to tighten and to produce collagen. A thermostat-like device controls monitors the  temperature and will shut down the machine if the temperature becomes even close to causing damage that would be irreversible. There is absolutely no danger to your spine, and certainly no possibility that the metal plates would be affected by the laser many tissue layers away from the plates. 
No magnetism such as the type that comes with an MRI examination is an entirely different story altogether, but best told on another day.
Thanks for your question.  

Yes! The titanium in your spine is not a contraindication to having a laser procedure on your abdomen.  Anyone with an "implant" should also be careful about getting bacteria into their blood stream with any surgical procedure or even an injury that breaks the skin, so talk to your doctor about taking prevenative antibiotics for a few days after the surgery.   Decreasing excess abdominal fat will probably relieve back strain so I encourage you to go ahead and have the procedure done. Best wishes!