A test that compared her predictions against common sense and chance failed to show any evidence of her having any special powers.

In 2015, Teissier unsuccessfully sued the Wikimedia Foundation, claiming that the French Wikipedia article about her damaged her reputation.

[27] Teissier argued, however, that her work is devoid of bias and had "focused only on the misunderstanding that astrology as a multimillennial knowledge vehicle" provokes.

[33] Her prepared statement was enthusiastically received by her supporters, but there was also a declaration from the editor-in-chief of Science et Vie Junior that what was occurring was a "farce".

[3][34] At end of the defense, the jury deliberated only briefly before Serge Moscovici admitted Teissier to her doctoral degree[35] with the "very honourable" distinction.

[43] They concluded that Teissier's work did not meet the requirements of scientific rigor of doctoral research, regardless of the discipline in question.

[44] In July 2015, Teissier sued the Wikimedia Foundation, saying the article about her on the French Wikipedia damaged her reputation, and required her to have the right of response.

In June 2016, The Court of Appeal in Paris dismissed the case, stating that the Wikimedia Foundation had a technical role of hosting provider, and was thus not involved in the content, and that the remarks about Teissier fell within the limits of free criticism.