What is scientific inquiry? who can use it and what does it involve

Scientific inquiry is a process of making an explanation of a question in the natural world by testing, investigating and collecting data, and experimenting. 

Scientific inquiry is to think , ponder, and have an interest in investigating something that exist or you think may exist or should exist. Anyone can use it ( kind of like the scientific method) but people who commonly use it seriously is police, scientists, and other career fields who find it necessary. Scientific inquiry involves a person, research tools, space, writing pad, and one, etc.