Texas Code of Criminal Procedure - CRIM P Art. 2.17. Conservator of the peace

Each sheriff shall be a conservator of the peace in his county, and shall arrest all offenders against the laws of the State, in his view or hearing, and take them before the proper court for examination or trial. He shall quell and suppress all assaults and batteries, affrays, insurrections and unlawful assemblies. He shall apprehend and commit to jail all offenders, until an examination or trial can be had.