Smolarski v. Owens

applying the factors of whether the stop was temporary and brief and conducted in the absence of a “police dominated” atmosphere as opposed to the isolation and intimidation that concerned the court in Miranda | “ Article 38.22, § 6, supra, is mandatory in its language and that it requires a trial court to file its findings of fact and conclusions of law regarding the voluntariness of a confession whether or not the defendant objects to the absence of such omitted filing”