Possible unfavourable effects of using in-house components for forensic expert molecular-genetic technologies

So-called in-house production of reagents, components and kits for DNA analysis which are made without strict quality control and standards are now widely practiced in forensic molecular-genetic examinations. Markers of molecular mass were studied to illustrate problems which may arise in use of such in-house components. Other difficulties and negative sequelae of in-house products are also demonstrated.