Consumer complaints under attorney investigation; no lawsuits filed yet. When certain consumer complaints affect a larger number of individuals, an attorney may begin a class action investigation. The number of people affected in order to begin an investigation can and will vary depending on the nature of the product in question and the complaint involved. For example, a serious auto defect can lead to a loss of many lives and prompt a class action investigation based on a small number of complaints; a mislabeled food product might be recalled but not result in actual injury to anyone and, therefore, not prompt a class action investigation. If an attorney determines there is cause for legal action, a class action investigation can lead to a class action lawsuit being filed.