The article analyzes the relevant in modern sociolinguistic conditions notion of "native speaker". The identification of traits, or linguistic markers, determining whether the speaker is a "native speaker" has a high practical significance. A pronunciation marker, a grammar marker, a lexical marker, a semantic marker and an extra-linguistic marker, which can most accurately demonstrate the level of language proficiency, and also show whether a person is a representative of a certain cultural and linguistic community, will help to recognize a foreign citizen as a language speaker of the Russian language. As an illustrative material, the article offers original authoring of special tasks and a system for the evaluation of the answers of applicants for recognition as a native speaker.