If you are pulled over for an offense and an officer smells alcohol on your breath in Allen, Texas then there is a good chance that the officer will ask you to submit to some Standardized Field Sobriety Tests. Those tests are for the officer to be able to justify that he had probable cause in order to arrest you for DWI.
If you are prosecuted, then it will be in McKinney, Texas where the Collin County Courthouse is located. The State will have much more of a burden to convict you than did the officer to arrest. The State will have to prove each and every one of the elements of DWI beyond a reasonable doubt. That is the highest burden of proof in our American System of Jurisprudence.
It is important to hire an experienced DWI lawyer so that you can come out of this unfortunate situation as easily as possible.