It was routinely being used in this period, and, of course, still is routinely used — because there were no complaints about it, not within the context of this study, anyway — it was routinely being used to deal with people who were violent, who were potentially violent, and also quite frequently used to deal with people who were simply passively noncompliant.
Se usaba habitualmente en ese período, y, claro, todavía se usa habitualmente porque nadie se quejaba -no en el contexto de este estudio- se usaba habitualmente para hacer frente a los violentos, a los violentos en potencia, y también se usaba muy a menudo para enfrentarse a quienes simplemente se resistían pasivamente.