(c) that the deponent is absent from the State or cannot be found after diligent search, or cannot be compelled to attend the Court, and if the Court is satisfied that such absence is caused by, or is due to any improper motive on the part of the deponent, and, if such motive exists, that there is any collusion between the deponent and the party tendering the deposition in respect of such motive, this provision shall not apply;