Hello! I'm glad to assist!
Está serves as the third person singular present form of the verb estar, which represents a form of "to be." When it precedes another verb, if that verb is an -ar type, it will conclude with -ando; for -er or -ir verbs, it finishes with -iendo.
Tú estás nadando (You are swimming)
Estoy corriendo (I am running)
Thus, the suitable response is "El culpable está mintiendo," states the honorable judge.
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