Is it a constitutional violation of a prisoner's right to access to counsel or access to court by prison officials who mistakenly open a letter addressed to him by mistake?

Isolated incidents of mail interference without any evidence of improper motive or resulting interference with the right to counsel or access to the courts do not give rise to a constitutional violation. See Meador v. Pleasant Valley State Prison, 312 F. App'x 954, 955 (9th Cir. 2009) (holding that prison officials' erroneous opening of one piece of legal mail "without a

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showing of actual injury or improper motive, cannot by itself establish a violation of his right of access to the courts"); Smith v. Maschner, 899 F.2d 940, 944 (10th Cir. 1990) (same).