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We present a theoretical analysis of signals for CPT and Lorentz violation ing-2 and charge-to-mass-ratio experiments on electrons and positrons in Penningtraps. Experiments measuring anomaly frequencies are found to be the mostsensitive to CPT violation. We find that the conventional figure of merit forCPT breaking, involving the difference of the electron and positron g factors,is inappropriate in this context, and an alternative is introduced. Bounds ofapproximately one part in 10^{20} are attainable.Comment: 5 pages, talk presented by R.B. at the 1998 Conference on Trapped  Charged Particles and Fundamental Physics, Pacific Grove, California,  August-September 199

Testing CPT and Lorentz symmetry with electrons and positrons in Penning traps