A warrantless arrest is usually a "strike while the iron is hot" situation. What Constitutes an Arrest Without a Warrant in Texas?Warrantless arrests are a different matter. A police officer may arrest someone for a misdemeanor without a warrant if the misdemeanor takes place in the presence of the officer. An officer must have probable cause to obtain a warrant or to make a warrantless arrest. An officer does not refuse to execute a valid warrant on other than legal grounds. The issue on this appeal is whether the appellant's warrantless arrest was made while the appellant was in a suspicious place and therefore, authorized. If an officer wants to search your house, don't open the door and allow police officers inside your home without a warrant. Following a valid traffic stop or detention, the officer may be able to arrest that individual immediately and without an arrest warrant. That way, he can be taken to jail in Bexar County, where the offense took place and where the warrant is actually out of.