A review of Lorentz and CPT tests performed in atomic systems is presented. A
theoretical framework extending QED in the context of the standard model is
used to analyze a variety of systems. Experimental signatures of possible
Lorentz and CPT violation in these systems are investigated. Estimated bounds
attainable in future experiments and actual bounds obtained in recent
experiments are given.Comment: latex, 10 pages, talk presented at Symmetries in Subatomic Physics,
Adelaide, Australia, March 200
