The phrase "at fault for using" is correct and usable in written English.
It can be used when assigning blame or responsibility for a specific action or behavior.
Example: "The company was at fault for using outdated technology, which led to the system failure."
Alternatives: "responsible for using" or "to blame for using".
Some defense lawyers are at fault for using the excuse of poor pay and high volume to ignore obligations to prepare a defense.
(Last time it said users who lost data were at fault for using unofficial accounts; it then subsequently nixed all third party access to its platform in the name of security).
Even if Lamadrid was transporting marijuana, however, the border agent may still be at fault for using his weapon, if the 19-year-old posed no imminent threat.
Her assessment of the situation is similar to that of a recent ― and controversial ― Orange County Grand Jury report that concluded there was no jailhouse informant program and that only a few "rogue" deputies were at fault for using jail informants outside the understanding of their managers.
They are at fault for using your love as leverage.
Traditional theists, on the other hand, attribute this power to God but are obliged to argue that God is not at fault for not using it or for using it in ways that we find utterly baffling (Viney 1998, 227).
That's both my fault (for using an iPhone first) and Android's own fault.
The city has claimed that pedestrians and parkgoers "should have known" the risks that trees present, and that a woman seriously injured while sitting on a park bench was at fault for failing to use "reasonable safety devices" that it never specifically described.
The RALU circuit can be tested for classical unidirectional stuck-at faults using the constant variable used in this design.
The report faulted banks for using inexperienced appraisers, and for creating unrealistic requirements, like six comparable sales instead of three, at a time of few sales.
While British Petroleum and federal regulators are certainly at fault for their reckless behavior, every American who uses oil -- which is to say, every American -- is incriminated in this ecological holocaust.
