The paper is focused on using computed tomography in forensic research and the performance of computed microtomograph Skyscan 1272. Computed tomography due to its non-destructive analysis of the internal structure of materials can be applied in many fields. This method also provides information on the distribution of fillers, pores, fibers and defects in the tested sample and their 3D visualization using specialized software. Computed microtomograph Skyscan 1272 can be successfully used in forensic investigation of an attacked seals. For example, during unauthorized consumption of energy and water supply, in the tempering with security seals and a consequent theft, in logistics, in the transport of cargo and money, in the counterfeit goods (trademark protection, seals, stamps) etc. Computed tomography is able to verify and detect unauthorized tempering with the security seal, stamps and envelopes.