Chosen-Message Simple Power Analysis, also called Collision Based Attacks (CBA), have been proposed by Fouque, Yen and Homma. These attacks aim at inducing and detecting collisions during modular operations. However, detecting collisions is a challenging task in real environments. Doing it in an automated manner is even more challenging. In this paper, we propose and compare some methods and criteria allowing to automatically (without any visual inspection) detect the occurrence of collisions in leakage traces acquired on modern (and thus noisy) circuits.