Chasis Check and Alignment

[drebar karat]

i bought a car months ago and after thorough checking, seems okay. However, i noticed that the car steers to the left always, although slightly. Sent to few shops for alignment and checked the rims, all okay. Recently, i knocked my car and realized that the preivous owner had knocks before and since, i could stop thinking if my chasis might have take hard blow. WHere can i check this and if there is a problem, where can i send my car for chasis alignment? Thanks for your help in advance.