In the present day Nigeria, the quality of the English language spoken by Nigerians, is perceived to have been deteriorating and needs urgent attention. The proliferation of books and articles in the recent years can be seen as the native outcrop of its received attention and recognition as a matter of discourse. Evidently, every profession, occupation or trade has its own variety of language for effective communication. In view of this, the Nigeria police force a law enforcement agency under the Federal Republic of Nigeria adopts the English Language as its official language, the degree of their proficiency is dependent on the level of education of each police officer. This work tries to evaluate their use of the English language; how effectively it is been used in the light if the analysis conclusion were made on the English language usage of the Nigerian Police Force. Also this community would be looked at as a speech community because it has its own language apart from the English Language which is intelligible to its members.