According to General Relativity, a passing gravitational wave can "shrink" objects and change their lengths. On this basis, the Laser Interferometer Gravitational-Wave Observatory’s (LIGO) designers used a modified Michelson interferometer, thinking that gravitational waves could be recorded by using laser beam interference to observe the interferometer’s arm variations. However, LIGO’s detectors have a basic problem: Light fields are also affected by passing gravitational waves. When one gravitational wave "hits" LIGO’s interferometers, it does not only "shrink" the interferometer’s arms, but in fact, distorts its own space-time fabric, also "shrinking" the light beams. This means that no phase difference can be observed in the output of Michelson’s interferometer, thus, gravitational waves cannot be recorded using this kind of equipment. Considering this problem, this author believes that LIGO’s detectors are not able to detect gravitational waves. However, after more than a decade in operation, without showing any results, in February 2016 the LIGO team announced the first detection of a gravitational wave in the GW150914 event, supposedly to be related to the collision of two black holes. Despite the fact that more than 400 physicists say that LIGO’s detection is true, for this author, Einstein’s equivalence principle presents a barrier for the operation of LIGO’s system, therefore, preventing it from detecting gravitational waves. This author has accessed the data from the GW150914 event and, by playing "devil's advocate", has gone beyond the LIGO team’s basic analysis. The results of the analysis, presented in this article, point to the fact that the signals recorded by LIGO at the GW150914 event, cannot originate from the collision of two black holes, instead probably being the result of random noise sources picked up by the detectors