According to the information shared by three unidentified sources aware of the proceedings at the US Federal Trade Commission (FTC), the agency's officials are apparently wavering on the decision of filing an antitrust lawsuit against Google.

As per the sources, the US regulators are not sure about whether they will be able to prove that Google's supposedly contentious mechanism of ranking search results actually hurts the consumers.

The sources revealed on the condition of anonymity that the FTC officials are not sure of whether there is sufficient evidence to successfully sue Google in an antitrust case, which will essentially pertain to Google's policy of giving top ranking to its own services while pushing down the services offered by rival companies.

In addition, the sources also said that the FTC officials are also assessing the allegation that the benefit of Google's ranking system to consumers outweighs the harm caused to the company's rivals, including NexTag Inc. and Kayak Software Corp.

Meanwhile, noting that the "search-biasing claim" is the only part of the potential antitrust lawsuit which pertains to Google's search-ranking policy, Boston University law professor Keith Hylton - who has authored many books on antitrust topics - said: "If that (search-biasing claim) drops out of the FTC's case, then you have something that doesn't seem to be all that interesting in terms of antitrust law."