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The aim of this study was to evaluate causes of contamination of a pig carcasses with Salmonella spp. at the slaughter line. During regular control of carcasses at the slaughter line, swabs were taken and existence of Salmonella spp. was discovered. All fattened pigs originated from the same farm. Forensic examination of presence of Salmonella spp. was carried out at the farm, from which slaughtered fattened pigs originated. At the farm, all of the biosecurity and procedural measures are regularly completed, microbiological control of a pig feed and it was discovered high level of health status of the herd. All samples of pooled feces of the pigs were examined to presence of Salmonella spp. and all of the results were negative. Blood serum of the pigs from the farm were seronegative to presence of antibodies specific to Salmonella spp. Transportation of fattened pigs is organized due to legal regulative and it lasted for 20 minutes. Based on forensic results, conclusion is that pigs, in this examination, got infected by Salmonella spp. at livestock depot in slaughterhouse and/or the carcasses were contaminated at slaughter line.