The article by D. Dieks examines the possibility of achieving faster-than-light communication using an EPR-type experimental setup. It argues that such superluminal communication is not possible due to the linearity of quantum mechanical evolution laws. The author discusses a recent proposal by Herbert, which suggests using a single experiment with a "multiplying device" to transmit information. However, the article demonstrates that this setup is inconsistent with quantum mechanics because the state predicted by quantum mechanics does not match the required final state for the multiplier to function as intended. Specifically, the probability distribution of outcomes for the electrons emerging from the multiplier does not allow B to determine what A has done, thus preventing superluminal communication. The article concludes that the linearity of quantum mechanical evolution laws is crucial in preventing causal anomalies and ensuring that quantum mechanics does not allow faster-than-light communication.The article by D. Dieks examines the possibility of achieving faster-than-light communication using an EPR-type experimental setup. It argues that such superluminal communication is not possible due to the linearity of quantum mechanical evolution laws. The author discusses a recent proposal by Herbert, which suggests using a single experiment with a "multiplying device" to transmit information. However, the article demonstrates that this setup is inconsistent with quantum mechanics because the state predicted by quantum mechanics does not match the required final state for the multiplier to function as intended. Specifically, the probability distribution of outcomes for the electrons emerging from the multiplier does not allow B to determine what A has done, thus preventing superluminal communication. The article concludes that the linearity of quantum mechanical evolution laws is crucial in preventing causal anomalies and ensuring that quantum mechanics does not allow faster-than-light communication.