Here is some of the article that was in Law Officer Magazine found online.
The whole article can be found here

By Greg Koran

In 1989, the introduction of lidar as an alternative to radar for speed enforcement hit many traffic divisions with an avalanche of hype, excitement and confusion. Unfortunately, many of the first-generation lidar units were heavy, bulky and expensive, and before officers and the courts could accept lidar units, questions about their accuracy and reliability needed to be answered. Today, technological advances have removed many of those earlier obstacles. Numerous traffic officers around the country now utilize lidar, and the courts have also seen the light.

How does radar stack up to this new kid on the block? .............. Click link above.