Any negative information could ruin a background check. However, some fundamental problems are considered the worst or most likely to wreck an application. You'll find them listed below.   ᐅ Criminal history, especially if it involves fraud or violent tendencies ᐅ Lies or obvious inconsistencie ᐅ Failed drug tests ᐅ Bad driving record ᐅ Poor credit ᐅ Reports from previous employers or rentals ᐅ Inability to verify information provided