  Let $\mathfrak{z}$ be a stochastic exponential, i.e.,
$\mathfrak{z}_t=1+\int_0^t\mathfrak{z}_{s-}dM_s$, of a local martingale $M$
with jumps $\triangle M_t>-1$. Then $\mathfrak{z}$ is a nonnegative local
martingale with $\E\mathfrak{z}_t\le 1$. If $\E\mathfrak{z}_T= 1$, then
$\mathfrak{z}$ is a martingale on the time interval $[0,T]$. Martingale
property plays an important role in many applications. It is therefore of
interest to give natural and easy verifiable conditions for the martingale
property. In this paper, the property $\E\mathfrak{z}_{_T}=1$ is verified with
the so-called linear growth conditions involved in the definition of parameters
of $M$, proposed by Girsanov \cite{Girs}. These conditions generalize the
Bene\^s idea, \cite{Benes}, and avoid the technology of piece-wise
approximation. These conditions are applicable even if Novikov, \cite{Novikov},
and Kazamaki, \cite{Kaz}, conditions fail. They are effective for Markov
processes that explode, Markov processes with jumps and also non Markov
processes. Our approach is different to recently published papers \cite{CFY}
and \cite{MiUr}.
