A preliminary knockout search is a limited search — typically limited to federal and/or state trademark application filings and registrations — to see if there are any clear and obvious obstacles. At Joshua IP our preliminary searches are done using professional search tools that typically provide better results that searching directly on USPTO.gov.
A preliminary knockout search typically does not include common law searching — such as websites, social media, business records, etc. If you are looking for a search that includes common law records, a comprehensive search (which is a more costly search) would be a better fit.