电影制片人柯克斯在没有试镜的情况下选出了罗伯特·阿拉马约 (Robert Aramayo) 饰演约翰·戴维森 (John Davidson) 的角色, 他赞扬了他对图雷特综合征活动者的真实描绘. Filmmaker Kirk Jones cast Robert Aramayo as John Davidson in "I Swear" without auditions, praising his authentic portrayal of the Tourette syndrome campaigner.

导演柯克·琼斯透露，他从一开始就放弃了传记片《我发誓》的试镜，信任罗伯特·阿拉马约饰演患有妥瑞症的苏格兰活动家约翰·戴维森。 Filmmaker Kirk Jones revealed he skipped auditions for the biopic "I Swear," trusting Robert Aramayo from the start to portray Scottish campaigner John Davidson, who lived with Tourette syndrome. 这部影片赢得6个BAFTA提名, 包括杰出英国电影, 强调Davidson与欺凌和社会排斥的斗争, The film, which earned six BAFTA nominations, including Outstanding British Film, highlights Davidson’s struggles with bullying and social exclusion while emphasizing resilience and empathy. Jones赞扬Aramayo通过几个月的准备工作取得的真实表现,并称这个故事在促进对神经多样性的理解方面是及时的。 Jones praised Aramayo’s authentic performance, developed through months of preparation, and called the story timely in promoting understanding of neurodiversity. 参加红地毯演出的Davidson赞扬影片在不鼓励同情的情况下提高了人们的认识,将Aramayo的描绘称为“绝对惊人 ” 。 Davidson, who attended the red carpet, commended the film for raising awareness without fostering pity, calling Aramayo’s portrayal “absolutely phenomenal.”