በመደበኛ ጉዳዮች አንድ ተጠርጣሪ ፖሊዝ ዘንድ እንዲቆይ የሚደረገው ፖሊስ ተጨማሪ ምርመራ ስለሚያስፈልገው ወይም ጉዳዩ ዋስትና ስለሚያስከለክል ነው።
Launching an investigation requires a higher degree of certainty by police that crime is occurring because an investigation's purpose is to prevent or solve a crime.